Cisco Systems VC-825 User's Manual
Contents
1. Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Codecs Table 58 Codec Hoot and Holler over IP Overview W By default Cisco IOS sends all VoIP traffic media using RTP at a rate of 50 packets per second The packets include not only the voice sample but also an IP User Datagram Protocol UDP and RTP header The IP UDP RTP header adds an additional 40 bytes to each packet The amount of bandwidth each VoIP call consumes depends on the codec selected The resulting bandwidths can be as follows e G 729 or G 729a 3 000 bytes 8 bits 24 Kb call e G 726 6 000 bytes 8 bits 48 Kb call e G 711 10 000 bytes 8 bits 80 Kb call In addition to these calculations network administrators must consider the Layer 2 headers Frame Relay PPP Ethernet and so on and add the appropriate number of bytes to each packet In Table 58 the assumption is that the payload size in bytes is 20 millisecond samples per packet with 50 packets per second The value of n is equal to the number of voice streams in a session The uncompressed bandwidth includes IP UDP RTP headers 40 bytes in the bandwidth calculation Compressed RTP cRTP reduces the IP UDP RTP headers to between 2 to 4 bytes per packet The calculation of compressed bandwidth below uses 4 bytes for a compressed IP UDP RTP header per packet Maximum RTP Control Protocol RTCP bandwidth is 5 percent of the total RTP traffi2. Router config voice port voice class permanent tag Assigns a previously configured voice class for a Cisco trunk or FRF 11 trunk to a voice port for the port that is allowed to speak Router config voice port connection plar tie line plar opx digits trunk digits answer mode Ties the voice port to a multicast session number Use the trunk keyword to specify a connection that emulates a permanent trunk connection to a PBX The digits argument specifies the destination telephone number Valid entries are any series of digits that specify the E 164 telephone number Router config voice port music threshold number Optional Sets the music threshold to make voice activated dialing VAD less sensitive The number argument is the on hold music threshold in decibels dB Valid entries are any integer from 70 to 30 Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP W Configuration Tasks Command Purpose Step 9 Router config voice port operation 2 wire 4 wire Specifies the cabling scheme for E amp M ports The 2 wire keyword is the default Choose 4 wire operation for the hoot and holler application Step10 Router config voice port type 1 2 3 5 Selects the appropriate E amp M interface type depending on the end connection such as PBX e Type 1 indicates the following lead configuration default this is the
3. parameters Configuring dial peers is similar to configuring static IP routes you are instructing the router what path to follow to route the call Dial peers are identified by numbers but to avoid confusing these numbers with telephone numbers they are usually referred to as tags Dial peer tags are integers that can range from 1 to 2 1 2147483647 Dial peers on the same router must have unique tags but you can reuse the tags on other routers The following commands show how to configure a dial peer with tag for this voice port Configure dial peer Conference 1 Phone number 111 Multicast address 237 111 0 0 udp port 22222 dial peer voice 1 voip destination pattern 111 session protocol multicast Cisco IOS Voice Video and Fax Configuration Guide VC 846 Cisco Hoot and Holler over IP Configuration Examples W session target ipv4 237 111 0 0 22222 ip precedence 5 codec g71lulaw amp Note The configuration for the codec g711ulaw in the above configuration is not necessary the default codec of g729r8 could be used and it would not display for show config Tips e The destination pattern for the VoIP dial peer matches the connection trunk string for the corresponding voice port e The session protocol multicast command is essential for voice multicasting e The session target for voice multicasting dial peers is a multicast address in the range of from 224 0 1 0 to 239 2
4. recommended option E Output relay to ground M Input referenced to ground e Type 2 indicates the following lead configuration E Output relay to SG M Input referenced to ground SB Feed for M connected to 48V SG Return for E galvanically isolated from ground e Type 3 indicates the following lead configuration E Output relay to ground M Input referenced to ground SB Connected to 48V SG Connected to ground e Type 5 indicates the following lead configuration E Output relay to ground M Input referenced to 48V Step11 Router config voice port signal wink start immediate delay dial Configures the signaling type for E amp M voice ports The default is wink start Select immediate for the Cisco hoot and holler over IP application In the immediate start protocol the originating side does not wait for a wink before sending addressing information After receiving addressing digits the terminating side then goes off hook for the duration of the call The originating endpoint maintains off hook for the duration of the call Step 12 Router config voice port voice port slot number subunit number port slot port ds0 group no Selects another voice port Step 13 Router config voice port voice class permanent tag Uses the voice class tag for the receive only port Cisco IOS Voice Video and Fax Configuration Guide vC 84
5. 0 Cisco Hoot and Holler over IP Step 14 Step 15 Step 16 Command Configuration Tasks W Purpose Router config voice port connection plar tie line plar opx digits trunk digits answer mode Ties the voice port to the same multicast session number as in Step 12 Use the trunk keyword and the digits argument for the hoot and holler application Router config voice port music threshold number Optional Sets the music threshold to make VAD less sensitive Router config voice port operation 2 wire 4 wire Specifies the calling scheme for E amp M ports The 2 wire keyword is the default Specify 4 wire operation for the hoot and holler application Configuring for Receive Only Mode Step 1 Step 2 Step 3 Step 4 To configure Cisco hoot and holler over IP as receive only mode use the following commands beginning in global configuration mode Command Purpose Router config class voice class permanent tag Enters voice class configuration mode and defines the voice class for receive only mode Router config class signal pattern idle receive idle transmit oos receive oos transmit word Specifies the received signal pattern Configures the ABCD bit pattern for Cisco trunks and FRF 11 trunks Specify the oos receive keywords and the word argument for the hoot and holler application Router config class signal timing oos supp
6. 164 standard number The plus sign is not supported on the Cisco MC3810 e string Indicates a series of digits that specify the E 164 or private dialing plan telephone number Valid entries are the digits 0 through 9 the letters A through D and the following special characters The asterisk and pound sign Indicate the keys that appear on standard touch tone dial pads Comma Inserts a pause between digits Period Matches any entered digit this character is used as a wildcard Percent sign Indicates that the previous digit pattern occurred zero or multiple times similar to the wild card usage in the regular expression Cisco IOS Voice Video and Fax Configuration Guide Bi vc 237 Cisco Hoot and Holler over IP W Configuration Tasks Command Purpose Note Plus sign Matches a sequence of one or more matches of the character pattern The plus sign used as part of the digit string is different from the plus sign that can be used in front of the digit string to indicate that the string is an E 164 standard number Circumflex Indicates a match to the beginning of the string Dollar sign Matches the null string at the end of the input string Backslash symbol Is followed by a single character matching that character or used with a single character having no other significance matching that character Question ma
7. 22222 predefined Cisco Hoot and Holler over IP Restrictions The restrictions for using Cisco hoot and holler over IP are as follows e Cisco hoot and holler over IP supports the mixing of only three voice streams e IP TV does not support the mixing of audio streams e IP TV supports only G 711 u law mu law e Voice Interface Card Basic Rate Interface VIC BRI is not supported Configuration Tasks To configure Cisco hoot and holler over IP perform the tasks in the following sections e Configuring Multicast Routing page 836 Required e Configuring the Virtual Interface page 836 Required e Configuring VoIP Dial Peers page 837 Required e Configuring E amp M Voice Ports page 839 Required if used e Configuring for Receive Only Mode page 841 Optional e Configuring Relevant Interface Serial Ethernet page 842 Required e Configuring Voice Ports in High Density Voice Network Modules page 842 Required if using TI E1 Cisco 10S Voice Video and Fax Configuration Guide Bi vc 235 Cisco Hoot and Holler over IP W Configuration Tasks Configuring Multicast Routing To enable multicast routing use the following commands beginning in global configuration mode Command Purpose Router config ip multicast routing Enables multicast routing Configuring the Virtual Interface To configure the virtual interface for multicast fast switching use the following commands beginning in global configu
8. 4 eS Router 2 36013 In router Abbott Figure 134 the phone is connected to voice port 2 0 0 using the router slot voice slot VIC port numbering convention This router is configured as in the following example hostname Abbott ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 1 1 1 1 255 0 0 0 ip pim sparse dense mode I interface Ethernet0 0 ip address 3 3 3 1 255 0 0 0 ip pim sparse dense mode ip route 2 0 0 0 255 0 0 0 3 3 3 2 voice port 2 0 0 voice class permanent 1 connection trunk 111 operation 4 wire dial peer voice 1 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 111 22222 Note The connection trunk connection type is a point to point connection similar to a tie line on a PBX network All voice traffic including signaling placed at one end is immediately transferred to the other Note The E amp M voice port must be configured for four wire operation Cisco IOS Voice Video and Fax Configuration Guide VC 844 Cisco Hoot and Holler over IP Configuration Examples W Configuring the Second Router Note In router Costello Figure 134 the E amp M phone is connected to voice port 3 1 1 Router Costello uses the same configuration as Abbott except for the following differences e The virtual interface must be on a differ
9. 55 255 255 This session target must be the same for all routers in a session The audio RTP port is an even number in the range of from 16384 to 32767 and must also be the same for all routers in a session An odd numbered port UDP port number 1 is used for the RTCP traffic for that session e The following codec restrictions apply You must configure the same codec on all dial peers and routers in a session Only G 711 G 726 and G 729 codecs are supported When the default codec G 729r8 is used it does not appear in the configuration e Voice activity detection is enabled by default Cisco recommends that this setting should not be changed Ethernet Configuration Configure the router s Ethernet interface as follows Configure physical interface for transmitting multicast packets interface ethernet 0 0 ip address 1 5 13 13 255 255 255 0 ip pim sparse dense mode Voice Multicasting over a WAN The configuration for voice multicasting sessions over IP on Frame Relay is the same as for the Ethernet LAN in the previous example Configure the WAN interface on each router with the ip address and ip pim commands and the sparse dense mode keywords as shown in the section Voice Multicasting over an Ethernet LAN Cisco 10S Voice Video and Fax Configuration Guide Bi vc 2a7 Cisco Hoot and Holler over IP WE Configuration Examples Quality of Service Voice traffic is much more sensitive to timin
10. 8 no frame relay adaptive shaping voice port 1 0 0 voice class permanent 1 connection trunk 111 music threshold 30 operation 4 wire dial peer voice 1 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 0 22222 ip precedence 5 Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP WE Configuration Examples Cisco IOS Voice Video and Fax Configuration Guide
11. Cisco Hoot and Holler over IP The voice multicasting feature on Cisco 2600 and 3600 series routers uses Cisco Voice over IP VoIP technology to create a permanently connected point to multipoint hoot and holler network over an IP connection This appendix describes the Cisco hoot and holler over IP feature and contains the following sections e Hoot and Holler over IP Overview page 825 e Cisco Hoot and Holler over IP Overview page 827 e Configuration Tasks page 835 e Configuration Examples page 843 To identify the hardware platform or software image information associated with a feature in this appendix use the Feature Navigator on Cisco com to search for information about the feature or refer to the softsware release notes for a specific release For more information see the Identifrying Supported Platforms section in the Using Cisco IOS Software chapter Hoot and Holler over IP Overview Four wire ear and mouth E amp M E1 T1 Foreign Exchange Office FXO and Foreign Exchange Station FXS configurations provide continuous VoIP connections across a packet network using the connection trunk mechanism By using the inherent point to multipoint connectivity of IP multicast IPmc the routers can take several inbound voice streams from the traditional hoot devices and forward the packetized voice over the IP network to all parties within a defined hoot and holler group Hoot and holler networks provide always on multiu
12. P arbitration and mixing Since hoot and holler is generally used to allow many people to simultaneously talk and listen to other people within a hoot group by definition it requires that the same speech be delivered to multiple parties at the same time In an IP network this functionality uses IPmc IPmc allows a source to send a single packet into the IP network and have it duplicated and sent to many listeners by the other routers within the network This technique is beneficial in that it does not require the source to know how many listeners there are and the source does not have the additional processing burden of having to send a copy of each packet to all listeners IPmc also allows listeners to dynamically join IPmc groups which eliminates the administrative burden of new users needing to be added every time a new IPmc session is initiated The individual router gateway can handle mixing and arbitrating the various voice streams that can be initiated or terminated on its voice ports This functionality is handled by the onboard DSPs on each voice card NM 1V NM 2V or NM HDV Arbitration involves identifying the various sources of the voice stream and mixing involves taking some of those voice streams and combining them into a single sourced voice stream Cisco hoot and holler over IP can handle many inbound voice streams but it only arbitrates and mixes three streams to be heard within the hoot group This value works fine in most applicat
13. andwidth is even more compelling with hoot and holler than with a toll bypass application because some hoot circuits may be active for an hour or two for morning reports but dead for the rest of the day the idle bandwidth can be used by the data applications during these long periods of inactivity Beginning with Cisco IOS Release 12 1 2 XH Cisco hoot and holler over IP can be implemented using Cisco s VoIP technology This solution leverages Cisco s IOS expertise in VoIP quality of service QoS and IP multicasting IPmc and is initially available on Cisco 2600 and 3600 series multiservice routers Figure 132 shows a diagram of the Cisco hoot and holler over IP solution connecting legacy hoot equipment over an IP network The V on the Cisco router icons signifies that some of the hoot and holler bridging function is being done by the router s digital signal processors DSPs Figure 132 Hoot and Holler over IP Using Cisco 2600 and Cisco 3600 Series Routers am 2 PBX E amp M phones ap Up _ Multicast group i 5 Multicast group 3 N j V Turret Turret E amp M ear and mouth FEYXOA Enrainn Evrhanna Offira i Four wire E amp M E1 T1 FXO and FXS configurations provide continuous VoIP connections across a packet network By using the inherent point to multipoint characteristic of IPmc the routers can take several inbound voice streams from the traditional hoot d
14. ast For further information about IP TV refer to the JP TV Content Manager User Guide E Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Hoot and Holler over IP Overview W For further information about interactive voice response IVR refer to Configuring Interactive Voice Response for Cisco Access Platforms Current Hoot and Holler Implementations Traditional hoot and holler networks see Figure 131 are analog multipoint four wire audio conference networks that are always up When a user wants to communicate the user pushes a button and speaks either through a microphone a hoot phone a turret or a squawk box Figure 131 Traditional Hoot and Holler Network Remote location Leased lines 2 Central site Remote p location ma N 1 a voice Remote T bridge location j 1 1 ae va Remote location La 4 wire phone or speaker with microphone 35836 Figure 131 illustrates a traditional hoot and holler network Each remote location is connected to a central bridge using leased lines Four wire connections and N 1 bridges are used to avoid echo problems Hoot and holler networks are typically spread over four to eight sites although financial retail networks may have hundreds of sites interconnected Within a site bridging mixing voice signals is done locally with a standard analog or digital bridge that may be part of a trading turret system Bet
15. c in a hoot and holler session Since the Cisco hoot and holler over IP application supports mixing of a maximum of three voice streams the RTCP bandwidth is limited to 5 percent of three voice stream traffic In addition to the above Layer 2 headers Frame Relay Point to Point Protocol Ethernet and so on should be considered and added to the bandwidth calculation Bandwidth Consideration Table Payload Size byte Bandwidth Voice Stream Kbps RTCP Bandwidth per Cisco Hoot and Holler over IP Session Kbps Example One Voice Stream ina Session Bandwidth in Kbps Uncompressed Compressed 1 n 3 2 n 3 g 729 20 24 9 6 3 6 27 6 13 2 g 726 80 48 33 6 7 2 55 2 40 8 g 711 160 80 65 6 12 0 92 0 71 6 cRTP Variable Payload Sizes and VAD Some network administrators may consider this amount of bandwidth per call unacceptable or outside the limits of the bandwidth they can provide especially in the WAN There are several options that network administrators have for modifying the bandwidth consumed per call e RTP header compression cRTP e Adjustable byte size of the voice payload e Voice activity detection VAD IP UDP RTP headers add an additional 40 bytes to each packet but each packet header is basically unchanged throughout the call Compressed RTP can be enabled for the VoIP calls which reduces the IP UDP RTP
16. connections are now carried in standard multicast RTP packets hoot channels can now be received by a soft client such as IP TV which can receive an IP multicast RTP stream An alternate migration strategy is to use Cisco hoot and holler over IP technology initially as a backup for the existing hoot circuits within a region with a phased plan of cutting over to Cisco hoot and holler over IP as the primary transport while keeping the existing circuits as a backup for a predefined burn in period Technical Details of the Cisco Hoot and Holler over IP Solution This section describes how Cisco hoot and holler over IP works from a technical perspective It covers design considerations in terms of IOS configurations and DSP mixing functionality It also covers bandwidth planning and QoS with the following assumptions e That you have some level of Cisco IOS experience e That you have some experience configuring QoS features using Cisco IOS software For assistance refer to the Cisco IOS IP and IP Routing Configuration Guide at the following URL http www cisco com univercd cc td doc product software ios 122 122cgcr fipr_c index htm e That you have some experience configuring VoIP using Cisco IOS software For assistance refer to the Cisco IOS Voice over IP Overview at the following URL e http www cisco com univercd cc td doc product software ios 122 122cgcr fvvfax_c vvfvoip htm e That you have some experience configuring IP multicasting
17. de frame relay class hoot n holler frame relay interface dlci 101 frame relay ip rtp header compression I map class frame relay hoot n holler frame relay cir 128000 frame relay bc 1280 frame relay mincir 128000 frame relay fragment 160 frame relay ip rtp priority 16384 16384 128 no frame relay adaptive shaping voice port 1 0 0 voice class permanent 1 connection trunk 111 music threshold 30 operation 4 wire I dial peer voice 1 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 0 22222 ip precedence 5 Router 2 The following output shows that Router 2 has been configured for Cisco hoot and holler over IP with a Frame Relay topology hostname Router 2 ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 2 2 2 2 255 255 255 0 ip pim sparse dense mode router rip network 2 2 2 0 network 5 5 5 0 interface Serial0 0 no ip address ip pim sparse dense mode encapsulation frame relay frame relay traffic shaping no frame relay broadcast queue interface Serial0 0 1 point to point ip address 5 5 5 2 255 255 255 0 ip pim sparse dense mode frame relay class hoot n holler Cisco 10S Voice Video and Fax Configuration Guide Ta Cisco Hoot and Holler over IP WE Configuration Examples frame relay interface dlci 100 frame relay ip rtp header compression map class frame relay hoot n holler
18. e their data and voice on the WAN to CIR and all three routers are using IP RTP priority to guarantee QoS for the Cisco hoot and holler over IP packets In addition the Frame Relay broadcast queue is disabled on the serial interfaces This occurs because by default the broadcast queue is only 40 packets deep and Cisco hoot and holler over IP transmits packets at 50 packets per second Unless the queue is disabled some packets would be dropped and voice QoS would be degraded The following output shows that Router 1 has been configured for Cisco hoot and holler over IP with Frame Relay topology hostname Router 1 I ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 I interface Vif1 ip address 1 1 1 1 255 255 255 0 ip pim sparse dense mode I router rip network 1 1 1 0 network 5 5 5 0 network 5 5 6 0 interface Serial0 0 no ip address ip pim sparse dense mode encapsulation frame relay frame relay traffic shaping no frame relay broadcast queue I interface Serial0 0 1 point to point ip address 5 5 5 1 255 255 255 0 ip pim sparse dense mode frame relay class hoot n holler E Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Configuration Examples W frame relay interface dlci 100 frame relay ip rtp header compression interface Serial0 0 2 point to point ip address 5 5 6 1 255 255 255 0 ip pim sparse dense mo
19. ent subnet from the first router e The IP address in the Ethernet configuration must be different from that of the first router e The voice port and slot should match the router s hardware configuration hostname Costello ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 2 2 2 2 255 0 0 0 ip pim sparse dense mode I interface Ethernet0 0 ip address 3 3 3 2 255 0 0 0 ip pim sparse dense mode ip route 1 0 0 0 255 0 0 0 3 3 3 1 voice port 3 1 1 voice class permanent 1 timeouts wait release 3 connection trunk 222 music threshold 30 operation 4 wire dial peer voice 1 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 111 22222 The multicast session for this port shown in the session target command must match the multicast session configured on the first router The codec configured for this dial peer must match the codec for the dial peer on the first router Both routers must be configured to use the same connection trunk and destination pattern Verifying the Configuration If you have configured your routers by following these examples you should now be able to talk over the telephones You can also use the show dial peer voice command on each router to verify that the data you configured is correct To verify that an audio path has been established use the show call active vo
20. etwork 1 5 13 0 I voice port 1 0 0 voice class permanent 1 connection trunk 111 music threshold 30 operation 4 wire I voice port 1 0 1 voice class permanent 1 connection trunk 112 music threshold 30 operation 4 wire I dial peer voice 111 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 111 22222 ip precedence 5 I dial peer voice 112 voip destination pattern 112 session protocol multicast session target ipv4 239 194 0 10 22224 ip precedence 5 Router 2 FXS Ports The following output shows that Router 2 has been configured for FSX ports hostname Router 2 ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 2 2 2 2 255 255 255 0 ip pim sparse dense mode I interface Ethernet0 0 ip address 1 5 13 2 255 255 255 0 ip pim sparse dense mode router rip network 2 2 2 0 network 1 5 13 0 I dial peer voice 111 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 111 22222 ip precedence 5 dial peer voice 112 voip destination pattern 112 session protocol multicast session target ipv4 239 194 0 10 22224 ip precedence 5 Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP amp Configuration Examples W Note If you want to join the hoot and holler session directly withou
21. evices and forward the packetized voice over the IP network to all parties within a defined hoot and holler group Voice Multicasting The voice multicasting feature on Cisco 2600 and Cisco 3600 series routers uses Cisco VoIP technology to create a point to multipoint hoot and holler network over an IP connection Cisco IOS Voice Video and Fax Configuration Guide VC 828 Cisco Hoot and Holler over IP amp Hoot and Holler over IP Overview W You can connect voice multicasting telephones to routers in the following ways e Connecta four wire E amp M telephone which has no dial and is always off hook directly to an E amp M voice interface card that is installed in a voice network module Configure the E amp M interface for four wire trunk operation For information about configuring E amp M interfaces see the chapter Configuring Voice Ports in this configuration guide e Connect a conventional telephone to a PBX that is connected to an E amp M voice interface card e Connecta conventional telephone to an FXS voice interface card that is installed in a voice network module e Connect a conventional telephone to a PBX that is connected through a E1 T1 line to a multiflex trunk interface card that is installed in a high density voice network module Note IP TV Access The voice multicasting feature supports only one E1 T1 line per high density voice network module The Cisco hoot and holler over IP feature e
22. frame relay cir 128000 frame relay bc 1280 frame relay mincir 128000 frame relay fragment 160 frame relay ip rtp priority 16384 16383 128 no frame relay adaptive shaping voice port 1 0 0 voice class permanent 1 connection trunk 111 music threshold 30 operation 4 wire I dial peer voice 1 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 0 22222 ip precedence 5 Router 3 The following output shows that Router 3 has been configured for Cisco hoot and holler with a Frame Relay topology hostname Router 3 ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 3 3 3 3 255 255 255 0 ip pim sparse dense mode router rip network 3 3 3 0 network 5 5 6 0 interface Serial0 0 no ip address ip pim sparse dense mode encapsulation frame relay frame relay traffic shaping no frame relay broadcast queue interface Serial0 0 1 point to point ip address 5 5 6 2 255 255 255 0 ip pim sparse dense mode frame relay class hoot n holler frame relay interface dlci 101 frame relay ip rtp header compression map class frame relay hoot n holler frame relay cir 128000 frame relay bc 1280 frame relay mincir 128000 Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Configuration Examples W frame relay fragment 160 frame relay ip rtp priority 16384 16383 12
23. g variations than data traffic For good voice performance configure your data network so that voice packets are not lost or delayed The following example shows one way to improve QoS for voice multicasting over a Frame Relay connection Configure physical interface for transmitting multicast packets Listen to packets of Session Announcement Protocol SAP This example uses a subinterface interface serial0 0 encapsulation frame relay frame relay traffic shaping no frame relay broadcast queue interface serial0 0 1 point to point ip address 5 5 5 5 255 255 255 0 ip pim sparse dense mode frame relay class hootie frame relay interface dlci 100 frame relay ip rtp header compression Frame relay class commands I map class frame relay hootie frame relay cir 64000 frame relay bc 2000 frame relay mincir 64000 no frame relay adaptive shaping frame relay fair queue frame relay fragment 80 frame relay ip rtp priority 16384 16383 64 Note Inthe frame relay ip rtp priority command the first number is the audio port The second number is the number of consecutive audio ports to which the IP RTP priority queuing applies The third number is the bandwidth which should equal the bandwidth needed for each call multiplied by the number of calls Cisco IOS Voice Video and Fax Configuration Guide VC 848 Cisco Hoot and Holler over IP Configuration Examples W Cisco Hoot and Holler over IP with Ether
24. headers from 2 bytes to 4 bytes per packet Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP HE Hoot and Holler over IP Overview Virtual Interface More information on cRTP may be found in the Quality of Service Overview chapter of the Cisco IOS Quality of Service Solutions Configuration Guide at the following URL http www cisco com univercd cc td doc product software ios 122 122cgcr fqos_c qcfintro htm In addition to reducing the IP UDP RTP headers per packet the network administrator also has the option of controlling how much voice payload is included in each packet This is done using the bytes keyword and argument in a VoIP dial peer The following example shows a dial peer configuration dial peer voice 1 voip destination pattern 4085551234 codec g729r8 bytes 40 session protocol multicast session target ipv4 239 10 108 252 20102 As the number of bytes per packet is modified so too is the number of packets per second that are sent VAD enables the DSPs to dynamically sense when there are pauses in a conversation When these pauses occur no VoIP packets are sent into the network This significantly reduces the amount of bandwidth used per VoIP call sometimes as much as 40 percent to 50 percent When voice is present VoIP packets are again sent When using Cisco hoot and holler over IP VAD must be enabled to reduce the amount of processing of idle packets by the DSPs In ba
25. icant some larger firms spend more than 2 million to 3 million per year just to distribute hoot and holler feeds Cisco s hoot and holler over IP feature e Eliminates yearly reoccurring switched circuit telephone company charges toll bypass e Eliminates the need for leased lines and the accompanying charges e Reduces the need for hoot and holler bridges e Improves hoot and holler network manageability e Reduces the time to troubleshoot a problem from hours to minutes e Reduces the time to provision bandwidth from days to a few hours e Increases productivity through future applications such as IP TV and turret support e Provides the ability to integrate voice video and data signaling capabilities Cisco hoot and holler over IP is supported on Cisco 2600 and 3600 series routers and on NM HDV NMZV and NM 2V network modules For information about installing voice network modules and voice interface cards in Cisco 2600 and Cisco 3600 series routers refer to the Cisco Network Module Hardware Installation Guide and the WAN Interface Card Hardware Installation Guide For information about configuring Voice over IP features refer to the Software Configuration Guide for Cisco 3600 Series and Cisco 2600 Series Routers to the Voice over IP Quick Start Guide and to the Voice over IP Overview chapter in this configuration guide For further information about IP multicasting refer to the IP Multicast Site at http www cisco com ipmultic
26. ice command This command displays all active voice calls traveling through the router Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP WE Configuration Examples High Density Voice Modules A multiflex trunk interface card in a high density voice network module requires special voice port configuration The card must be configured first as is shown in the following output voice card 6 codec complexity high Note Codec complexity must be high Voice multicasting does not support medium complexity which is the default The following commands show how to define the T1 channel and signaling method and how to map each DSO to voice port slot port ds0 group no controller T1 6 0 dsO group 1 timeslots 1 type e amp m immediate start dsO group 2 timeslots 2 type e amp m immediate start dsO group 3 timeslots 3 type e amp m immediate start dsO group 22 timeslots 22 type e amp m immediate start dsO group 23 timeslots 23 type e amp m immediate start The following commands show how to configure the voice ports on the multiflex trunk interface card voice port 6 0 1 connection trunk 111 voice port 6 0 2 connection trunk 111 voice port 6 0 3 connection trunk 111 voice port 6 0 22 connection trunk 111 voice port 6 0 23 connection trunk 111 Dial Peer Configuration Cisco IOS software uses dial peers to tie together telephone numbers voice ports and other call
27. igh Density Voice Network Modules Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 A multiflex trunk interface card NM HDV in a high density voice network module requires special voice port configuration when connecting for T1 E1 operation To configure a multiflex trunk interface card in a high density voice network module use the following commands beginning in global configuration mode Command Purpose Router config voice class permanent tag Defines voice class for transmit receive mode and enters voice class configuration mode Router config class signal timing oos timeout seconds disabled Disables signaling loss detection Use the disabled keyword for hoot and holler applications Router config class signal keepalive number Specifies the keepalive signaling packet interval in seconds The valid range is from 1 to 65535 Router config class exit Exits voice class configuration mode Router config voice card slot Enters voice card configuration mode and selects the card to configure The s ot argument is a value from 0 to 3 that identifies the physical slot in the chassis where the voice card is located Router config voicecard codec complexity high medium Specifies call density and codec complexity based on the codec standard you are using For hoot and holler applications the codec complexity must be high Voice multicasting does not support
28. ing of market movements recommendations and commentary Later in the day the patch panel may be reconfigured to allow for local or regional conference bridges This allows for multiple conference calls for various purposes without provisioning multiple circuits By segmenting the network into regions troubleshooting is also easier because any audio disturbance feedback or level problems can be isolated to a smaller subset of remote offices for more specific troubleshooting Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Hoot and Holler over IP Overview W The highly segmented nature of existing hoot and holler networks can be leveraged in the migration from legacy hoot technology to Cisco hoot and holler over IP A small segment of the hoot network can be converted to Cisco hoot and holler over IP while preserving the operational procedures at the main office Note that the migration to Cisco hoot and holler over IP does not require replacing end user equipment or central bridging equipment The main impetus for this first phase of migration is to eliminate the recurring expense of carrier multidrop circuits or dedicated leased lines Migration success is maximized by minimizing changes to the end user while realizing an attractive payback period on the capital costs As the entire hoot network converges with the data network additional functionality can be introduced Since the hoot and holler
29. ions because with more than three streams two things happen in normal conversation e People are not able to distinguish the content of more than three voice streams e People normally stop speaking if they hear others talking ahead of them Note The mixing functionality does not do a summation of the voice streams The DSPs in the Cisco hoot and holler over IP feature can mix up to three streams The mixing of the three streams is important to network administrators in considering how much bandwidth they should plan for in their Cisco hoot and holler over IP networks This is especially crucial when planning for WAN bandwidth which is often much more expensive and much less available than LAN bandwidth The advantage to this functionality is that a network administrator never has to be concerned about provisioning voice bandwidth for more than three times each call s bandwidth for each WAN site which helps to simplify overall network planning Bandwidth Planning Four main factors must be considered with regard to bandwidth planning for Cisco hoot and holler over IP e Codecs used for VoIP G 711 G 726 G 729 and G 729a are currently supported e Bandwidth management techniques e The number of voice streams to be mixed e The amount of guaranteed bandwidth available on the IP network This includes both LAN and WAN bandwidth and should take into consideration other factors such as Frame Relay committed information rate
30. medium complexity which is the default Router config voicecard exit Exits voice card configuration mode Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Configuration Examples W Command Purpose Step8 Router config controller t1 e1 number Enters controller configuration mode and selects the T1 or E1 controller to configure Step9 Router config controller ds0 group ds0 group no Maps a group of time slots to a DSO group timeslots timeslot list type type Step10 Router config controller exit Exits controller configuration mode Step11 Router config voice port Enters voice port configuration mode and slot number subunit number port configures a DSO group that was created in Step 9 slot port ds0 group no in this configuration task table Step12 Router config voice port connection plar tie line Ties the connection trunk to a multicast address plar opx digits trunk digits answer mode This command is repeated for each DSO group All groups use the same multicast address if connecting to the same multicast session Use the trunk keyword and the digit argument for hoot and holler applications Step 13 Router config voice port voice class permanent tag Specifies the receive only port Configuration Examples This section provides a series of configuration examples to help you become familiar with voice
31. multicasting These examples also show how to ensure that each configuration is working properly before proceeding to the next step e Voice Multicasting over an Ethernet LAN page 844 e Voice Multicasting over a WAN page 847 e Cisco Hoot and Holler over IP with Ethernet Topology Two Hoot Groups e Cisco Hoot and Holler over IP with Frame Relay Topology One Hoot Group Note In all the following configuration examples the routers are configured with the interface command and the name tag vif1 This is a virtual interface that is similar to a loopback interface it is a logical IP interface that is always up when the router is active In addition it must be configured so that the Cisco hoot and holler over IP packets that are locally mixed on the DSPs can be fast switched along with the other data packets This interface needs to reside on its own unique subnet and that subnet should be included in the routing protocol updates RIP OSPF and so on Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP WE Configuration Examples Voice Multicasting over an Ethernet LAN Figure 134 shows the simplest configuration for voice multicasting over an Ethernet LAN Two routers are connected to each other over the Ethernet LAN One E amp M phone is connected to each router Figure 134 Voice Multicasting over a LAN E amp M VIC IP cloud 2 0 0 gt BS gt Router 1 E amp M VIC 3 1 1
32. n even number in the range of from 16384 to 32767 and must also be the same for all ports in a session An odd numbered port UDP port number 1 is used for the RTCP traffic for that session Router config dial peer ip precedence number Optional Specifies the IP precedence Router config dial peer codec Configures the codec You must configure the same codec on all dial peers in a session When the default codec g729r8 is used it does not appear in the configuration when the show running config command is used Configuring E amp M Voice Ports Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 To configure E amp M voice ports use the following commands beginning in global configuration mode Command Purpose Router config voice class permanent tag Defines voice class for transmit receive mode Router config class signal timing oos timeout seconds disabled Disables signaling loss detection Use the disabled keyword in hoot and holler applications The seconds argument is not used in these applications Router config class signal keepalive number Specifies the keepalive signaling packet interval Router config class exit Exits voice class configuration mode Router config voice port slot number subunit number port slot port ds0 group no Enters voice port configuration mode and selects the voice port to configure
33. nables you to access ongoing IP TV multicasts for listening to voice content of the IP TV session For complete information on IP TV see the IP TV Content Manager Installation and User Guide The following figure illustrates Cisco hoot and holler being used to access IP TV multicasts Figure 133 Cisco Hoot and Holler over IP Access to IP TV Multicast IP TV Content Manager IP TV server AN amp 35970 viewer For the Cisco hoot and holler over IP and IP TX interaction to work correctly do the following e Ensure that you have properly connected and configured your network for VoIP Enable the Cisco hoot and holler over IP feature using the session protocol multicast command e Ensure that the server configured with the IP TV Content Manager is in the same Ethernet network as the Cisco hoot and holler over IP functionality e Ensure that the Cisco hoot and holler over IP multicast details are registered with the IP TV Content Manager Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP HE Hoot and Holler over IP Overview amp Note Content Manager amp IP TV support for Cisco hoot and holler over IP uses only G 711 u law mu law encoding IP TV supports one audio stream for Cisco hoot and holler over IP IP TV does not support arbitration and mixing On the configuration screen Administration Tool gt Scheduled Programs gt New Program g
34. need to dial any phone numbers to reach the other members of a hoot group To simulate this functionality Cisco IOS provides a feature called connection trunk Connection trunk provides a permanent voice call without requiring any input from the end user because all the digits are internally dialed by the router gateway Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Cisco Hoot and Holler over IP Restrictions W With traditional VoIP usages of connection trunk the call is mapped to a remote router gateway and all the H 323 signaling is handled dynamically when the trunk is established With hoot and holler over IP the connection trunk is associated with the IP address of the IP multicast group that maps to the hoot group In addition all negotiation of UDP ports for the audio stream is manually configured The following example shows an E amp M voice port connection trunk set up for Cisco hoot and holler over IP voice port 1 0 0 connection trunk 111 music threshold 30 operation 4 wire I dial peer voice 1 voip destination pattern 111 voice class permanent 1 session protocol multicast session target ipv4 237 111 0 0 22222 ip precedence 5 In this example the digits in the connection trunk string match the destination pattern of the VoIP dial peer Also the session protocol is set to multicast and the session target is pointing to the IPmc group number with the UDP port
35. net Topology Two Hoot Groups The following figure illustrates Cisco hoot and holler over IP being used with an Ethernet topology Figure 135 Cisco Hoot and Holler over IP with Ethernet Topology O DY E amp M 4 wire FXS eae Router 1 Bg Router 2 35969 BS vo Ma Gaii PBX J rox Vy Group 2 rii E amp M ear Pi mouth FXO Foreign Exchange Office FXS Foreign Exchange Station In this configuration two hoot and holler groups are set up by defining two multicast groups 237 16 8 11 and 237 16 26 12 and mapping the connection command and trunk keyword specifying 11 and connection command and trunk keyword specifying 72 from the voice ports to the VoIP dial peers associated with each group Each router is connected to a dedicated switch port and IP precedence is set to 5 for all Cisco hoot and holler over IP packets Router 1 E amp M Four Wire Ports The following output shows that Router 1 has been configured for E amp M four wire ports hostname Router 1 ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 1 1 1 1 255 255 255 0 ip pim sparse dense mode I interface Ethernet0 0 ip address 1 5 13 1 255 255 255 0 ip pim sparse dense mode router rip network 1 1 1 0 Cisco 10S Voice Video and Fax Configuration Guide I VC 849 Cisco Hoot and Holler over IP WE Configuration Examples n
36. ration mode Command Purpose Step1 Router config interface type number name tag Defines a virtual interface for multicast fast switching Routers joining the same session must have their virtual interfaces on different subnets Otherwise packets are not switched to the IP network Step2 Router config if ip address ip address mask Assigns the IP address and subnet mask for the secondary virtual interface Step3 Router config if ip pim dense mode sparse mode Specifies Protocol Independent Multicast PIM sparse dense mode Whatever mode you choose should match all the interfaces in all the routers of your network Cisco IOS Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP Configuration Tasks W Configuring VolP Dial Peers To configure the VoIP dial peers on the router use the following commands beginning in global configuration mode Command Purpose Step1 Router config dial peer voice tag voip Assigns a variable number tag to the VoIP dial peer and enters dial peer configuration mode Step2 Router config dial peer destination pattern Specifies the E 164 address associated with this string T dial peer The destination pattern for the VoIP dial peer must match the value of the multicast session number string for the corresponding voice port The keywords and arguments are as follows e Optional Specifies a character indicating an E
37. ress all seconds If the transmit out of service pattern from the PBX to the network matches for the time specified the router stops sending packets to the network Router config class signal keepalive number Specifies keepalive signaling packet interval Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP W Configuration Tasks Configuring Relevant Interface Serial Ethernet Step 1 Step 2 Step 3 Step 4 To configure either the serial or Ethernet interface use the following commands beginning in global configuration mode Command Purpose Router config interface type slot port adapter port ethernet serial Configures the physical interface serial Ethernet for transmitting multicast packets and enters interface configuration mode Router config if ip address ip address mask secondary Assigns the IP address and subnet mask for the interface The secondary keyword is optional It specifies that the configured address is a secondary IP address If this keyword is omitted the configured address is the primary IP address Router config if ip pim dense mode sparse mode sparse dense mode Specifies Protocol Independent Multicast PIM Whatever mode you choose should match all the interfaces in all the routers of your network Router config if no shutdown Enables the interface Configuring Voice Ports in H
38. rk Indicates that the previous digit occurred zero or one time Brackets Indicates a range of digits A range is a sequence of characters enclosed in the brackets and only numeric characters from 0 to 9 are allowed in the range This is similar to a regular expression rule Parentheses Indicates a pattern and is the same as the regular expression rule for example 408 555 Parentheses are used in conjunction with symbols or For more information on applying wildcard symbols to destination patterns and the dial strings that result see the Configuring Dial Plans Dial Peers and Digit Manipulation chapter in this configuration guide T Optional Control character indicating that the destination pattern value is a variable length dial string Step 3 Router config dial peer session protocol multicast This step is mandatory for voice multicasting and is the command introduced specifically for the Cisco hoot and holler over IP application Cisco IOS Voice Video and Fax Configuration Guide VC 838 Cisco Hoot and Holler over IP Step 4 Step 5 Step 6 Configuration Tasks W Command Purpose Router config dial peer session target Assigns the session target for voice multicasting dial peers This is a multicast address in the range of from 224 0 1 0 to 239 255 255 255 and must be the same for all ports in a session The audio RTP port is a
39. ser conferences without requiring that users dial into a conference These networks came into being more than 40 years ago when local concentrations of small specialized businesses with common time critical informational interests began to install their own phone wires speakers called squawk boxes and microphones between their businesses to ask each other about parts that customers needed These networks functioned as crude do it yourself business to business intercom systems Hoot and holler broadcast audio network systems have since evolved into the specialized leased line networks used by financial and brokerage firms to trade stocks and currency futures and the accompanying time critical information such as market updates and morning reports Users of various forms of hoot and holler networks now include brokerages news agencies publishers weather bureaus transportation providers power plant operators manufacturers collectibles dealers talent agencies and nationwide salvage yard organizations Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP HE Hoot and Holler over IP Overview Hoot and holler is used in these various industries as a way to provide a one to many or many to many conferencing service for voice communications In the past hoot and holler was deployed using point to point telephone company circuits and a hoot and holler bridging and mixing functionality that was pro
40. sic VoIP VAD can be enabled or disabled but since the DSPs also have to do arbitration and mixing VAD must be disabled to reduce the DSPs processing load In addition to enabling VAD which is only by default network administrators should modify the VAD parameters that sense background noise so that idle noise does not consume bandwidth This can be configured as in the following E amp M port example voice class permanent 1 signal timing oos timeout disabled Signal keepalive 65535 l voice port 1 0 0 voice class permanent 1 connection trunk 111 music threshold 30 operation 4 wire The configuration above is used for a voice port that is in send receive mode and only noise above 30Db is considered voice In all Cisco hoot and holler over IP implementations the routers are configured with an interface vif1 This is a virtual interface that is similar to a loopback interface a logical IP interface that is always up when the router is active In addition it must be configured so the Cisco hoot and holler over IP packets that are locally mixed on the DSPs can be fast switched along with the other data packets This interface must reside on its own unique subnet and that subnet should be included in the routing protocol updates Routing Information Protocol RIP Open Shortest Path First OSPF and so on Connection Trunk Cisco hoot and holler over IP provides an always on communications bridge end users do not
41. t Configuration provide the following details e Multicast address e RTP port defined by the dial peer in the router e IP TV server IP address or name e From the Settings gt Content Manager option do the following Click Add New Enter the IP TV server name Enter the port number It must be 80 because it is HTTP Click OK and exit Note In Content Manager be sure to specify the multicast IP address and RTP port for the Cisco hoot and holler over IP session Interactive Voice Response The Cisco hoot and holler over IP feature can support interactive voice response IVR as a means of authentication authorization and accounting AAA control See the Configuring TCL IVR Applications chapter in this configuration guide or refer to the Cisco IOS Voice Video and Fax Command Reference for more information Migration Strategy To aid troubleshooting and allow for regionalized hoot and holler conferences most hoot and holler networks today are structured by interconnecting multiple regional hoot networks with a centralized bridge The regional hoot networks are built using either carrier based multidrop circuits or point to point circuits bridged by the customer All of these circuits are connected through patch panels that allow for these regional bridges to be connected for a larger corporate wide conference call This is typically done for the morning call that is broadcast to all locations advis
42. t having to dial any session numbers use the connection command and the plar keyword followed by the multicast session number Router 3 FXO Ports The following output shows that Router 4 has been configured for FXO ports hostname Router 3 ip multicast routing voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 interface Vif1 ip address 3 3 3 3 255 255 255 0 ip pim sparse dense mode interface Ethernet0 0 ip address 1 5 13 3 255 255 255 0 ip pim sparse dense mode router rip network 3 3 3 0 network 1 5 13 0 dial peer voice 111 voip destination pattern 111 session protocol multicast session target ipv4 237 111 0 111 22222 ip precedence 5 dial peer voice 112 voip destination pattern 112 session protocol multicast session target ipv4 239 194 0 10 22224 ip precedence 5 Cisco 10S Voice Video and Fax Configuration Guide Cisco Hoot and Holler over IP WE Configuration Examples Cisco Hoot and Holler over IP with Frame Relay Topology One Hoot Group Router 1 Figure 136 Cisco Hoot and Holler over IP with Frame Relay Topology T Router 1 YD IP multicast network Router 2 Router 3 35838 In this topology three routers are connected using 64K Frame Relay PVCs in a hub and spoke topology with Router 1 being the hub One hoot and holler group has been defined All three routers have been configured to traffic shap
43. using Cisco IOS software For assistance refer to Cisco IOS Configuring IP Multicast Routing at the following URL http www cisco com univercd cc td doc product software ios 122 122cgcr fipr_c ipcpt3 e That you have a working IP network with IP multicasting configured using the Cisco 2600 and Cisco 3600 series routers For assistance refer to the following documents at the Cisco Connection Online CCO Web site Cisco IOS Configuration Guides and Command References http www cisco com univercd cc td doc product software ios 122 122cgcr index htm Cisco 2600 Series Routers http www cisco com univercd cc td doc product access acs_mod cis2600 index htm Cisco 3600 Series Routers http www cisco com univercd cc td doc product access acs_mod cis3600 index htm e That you are familiar with Cisco IP TV For assistance refer to Cisco IOS Software Configuration at the following URL http www cisco com univercd cc td doc product webscale iptv e That you understand basic hoot and holler concepts and equipment Cisco 10S Voice Video and Fax Configuration Guide vce Cisco Hoot and Holler over IP HE Hoot and Holler over IP Overview IP Multicast and DSP Arbitration and Mixing amp When deploying Cisco hoot and holler over IP first consider how the voice streams are going to be mixed and how they will be distributed to other locations This is done using a combination of two technologies e IPmc e DS
44. vided either by the customer or as a service of the Public Switched Telephone Network PSTN carrier A common use of hoot and holler is a broadcast audio network that is used throughout the brokerage industry to communicate morning reports as well as to advise the trading community within a brokerage firm on market movements trade executions and so on All users can talk simultaneously with each other if desired But more commonly a broker in a field office will shout an order to the trading floor The shout ensures that the trading floor can hear the order and a floor trader can confirm the transaction A typical brokerage firm has several of these networks for equity retail and bonds with network size and degree of interactivity varying depending on the application Within the financial community there are two general uses for hoot and holler networks e Market updates Market update morning report hoot networks tend to be active for an hour in the morning and inactive for the rest of the day e Trading Trading hoot networks tend to be more widely used throughout the trading day Both of these applications can reap significant advantages by running over an IP network because any idle bandwidth can be reclaimed by data applications Today most hoot and holler customers pay for separate leased line charges from a common carrier to transport their hoot and holler to remote branch offices This recurring charge is usually signif
45. ween sites there are two prevalent methods for providing transport e Point to point leased lines with customer provided audio bridging at a central site e Carrier provided audio bridging When customers provide their own bridging services with point to point leased lines branch offices in a metropolitan area commonly have 25 to 50 lines or more The second method carrier provided audio bridging is prevalent within the United States but rare for overseas transport In this scenario the audio bridges are located at the carrier s central office and the four wire lines are terminated at the client s site on a local audio bridge equipped with four wire plug ins which then feed to local public address PA system speakers Customer provided hoot bridging services can now be replaced with a Cisco hoot and holler over IP solution Cisco Hoot and Holler over IP Overview Cisco s VoIP technology which was initially focused on traditional PBX toll bypass applications can be used to combine hoot and holler networks with data networks While some customers may have done some level of hoot and data integration in the late 1980s with time division multiplexing TDM this form of integration does not allow for the dynamic sharing of bandwidth that is characteristic of VoIP Cisco 10S Voice Video and Fax Configuration Guide Bi vc 227 Cisco Hoot and Holler over IP HE Hoot and Holler over IP Overview Note This dynamic sharing of b
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