TC400B User Manual
Contents
1. Only qualified service personnel should continue with hardware installation and configuration of the TC400B card Users should not attempt to perform these functions themselves This card is for use in Listed I T E information technology equipment only The TC400B card is a 32 bit 33MHz card keyed for 3 3 or 5 0 volt operation and works in any PCI 2 2 or higher compliant slot Hardware Installation 1 Power down your computer and unplug it from its power source 2 Attach a static strap to your wrist and open the case 3 Remove the bracket place holder and insert the card into the PCI slot See Figure 4 Figure 4 Insert the Card 4 Replace the cover to your computer Release 1 0 Digium Inc Page 17 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Chapter 2 Card Installation Software Installation If you are using the 1 2 x series of Asterisk and Zaptel you will need Asterisk 1 2 15 or newer and Zaptel 1 2 13 or newer If you are using the 1 4 x series of Asterisk and Zaptel you will need Asterisk 1 4 1 or newer and Zaptel 1 4 1 or newer If you are using Asterisk Business Edition you will need version B 1 4 or newer Asterisk Zaptel 1 2 Installation 1 Go to www asterisk org and download zaptel version 1 2 13 or greater Unpack the tarball tar zxvf zaptel 1 X X tar gz cd zaptel 1 xX x make make install 2 Load Zaptel drivers into the kernel using2. First Edition CSA C22 2 No 60950 1 03 Ist Ed April 1 2003 IEC 60950 1 2001 First Edition EN 60950 AS NZS 60950 Note Finland Norway and Sweden require that equipment using this product must be located in a Restricted Access Location RAL Emissions 47 CFR Part 15 Subpart B 47 CFR Part 15 Subpart B Class B EN 55022 1998 Class B EN 55022 1998 Class B Radiated and Conducted EN 55024 1998 IEC 61000 Immunity EN55024 ITE EN61000 Release 1 0 Digium Inc Page 3 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 FCC Part 15 This device complies with part 15 of FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired operation Page 4 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Introduction to TC400B Documentation This manual contains product information for the TC400B card Be sure to refer to any supplementary documents or release notes that were shipped with your equipment The manual is organized in the following manner Chapter Tae p x Title Description Appendix 1 Overview Identifies the features of your card This chapter covers applications and uses of the TC400B in the real world 2 Car
3. supported exclusively on Linux loopback A state in which the transmit signal is reversed back as the receive signal typically by a far end network element MGCP Media Gateway Control Protocol multiplexing Transmitting multiple signals over a single line or channel FDM frequency division multiplexing and TDM time division multiplexing are the two most common methods FDM separates signals by dividing the data onto different carrier frequencies and TDM separates signals by interleaving bits one after the other Page 32 Digium Inc Release 1 0 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms MUX multiplexer A device which transmits multiple signals over a single communications line or channel See multiplexing PBX private branch exchange A smaller version of a phone company s large central switching office Example Asterisk PCI peripheral component interconnect A standard bus used in most computers to connect peripheral devices POP point of presence The physical connection point between a network and a telephone network A POP is usually a network node serving as the equivalent of a CO to a network service provider or an interexchange carrier POTS plain old telephone service Standard phone service over the public switched telephone network PSTN This service provides analog bandwidth of less than 4 kHz PPP point to point prot
4. 00030 VolPon Chapter 1 Overview Features 96 channels of bi directional G 729a 8 Kbit transcoding Or 92 channels of bi directional G 723 1 5 3Kbit transcoding SIP Phone Asterisk Server g00v0L TE412P HILAL Figure 1 Sample Telco Application Page 12 Digium Inc www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Release 1 0 Fax 44 0 1245 600030 Chapter 1 Overview SIP SIP Phone Phone Asterisk Asterisk Server Server TC400B ITSP or SIP Trunk Figure 2 Sample Network Application Release 1 0 Digium Inc Page 13 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 1 Overview What is Asterisk Asterisk is the first Open Source PBX Since it runs on Linux it inherits all of the power and stability of the operating system The name Asterisk is derived from the all inclusive wildcard symbol in UNIX because it is Opening a wide range of opportunities for developers worldwide to create solutions which would otherwise be cost prohibitive Asterisk allows you to create a PBX solution that rivals the features and functionality of traditional telephony switches Current PBX solutions are expensive and proprietary International companies are discovering that Asterisk is cost effective low maintenance and flexible enough to handle all of their voice and data networking Combined with Digium hardware and a
5. 1 and mu law on page 35 ANSI American National Standards Institute An organization which proposes and establishes standards for international communications asynchronous Not synchronized not timed to an outside clock source Transmission is controlled by start bits at the beginning and stop bits at the end of each character Asynchronous communications are often found in internet access and remote office applications attenuation The dissipation of a transmitted signal s power as it travels over a wire bandwidth The capacity to carry traffic Higher bandwidth indicates the ability to transfer more data in a given time period Release 1 0 Digium Inc Page 27 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms bit The smallest element of information in a digital system A bit can be either a zero or a one bps bits per second A measurement of transmission speed across a data connection broadband Broadband transmission shares the bandwidth of a particular medium copper or fiber optic to integrate multiple signals The channels take up different frequencies on the cable integrating voice data and video over one line channel A generic term for an individual data stream Service providers can use multiplexing techniques to transmit multiple channels over a common medium Cat5 Category of Performance for wiring and cabling
6. 95 Fax 44 0 1245 600030 VolPon Appendix A Specifications This appendix provides specifications required environmental conditions and maximum power consumption for the TC400B card Physical Size 4 69 x 2 52 x 0 63 11 9 x 6 4 x 1 6 cm PCB size does not include the PCI bracket Weight 2 5 oz 70 9 gm Interfaces PCI Bus 3 3V or 5V bus slot half length slot minimum size 33MHz minimum bus speed compliant with PCI 2 2 or greater Environment Temperature 0 to 50 C 32 to 122 F operation 20 to 65 C 4 to 149 F storage Humidity 10 to 90 non condensing Supported Codecs G 729a 8 0Kbit G 723 1 5 3kbit u law u law a law a law Release 1 0 Digium Inc Page 25 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix A Specifications Hardware and Software Requirements 400 Mhz Pentium III or better 512 MB RAM Available PCI Slot as described previously Linux 2 6 kernel Table A 1 Maximum Power Consumption Model Power TC400B 3 3V 0 Watts 5V 4 Watts Page 26 Digium Inc www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Release 1 0 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms a law Mainly used in European telephone networks for the conversion between analog and digital signals in PCM applications Similar to the North American mu law standard Refer to G 711 on page 3
7. America and Japan E3 in Europe Up to 672 voice channels DSOs DS3 T3 E3 lines are not part of the PSTN Release 1 0 Digium Inc Page 29 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms DTMF Dual Tone Multi Frequency Push button or touch tone dialing E1 The European equivalent of North American T1 transmits data at 2 048 Mbps up to 32 voice channels DSOs E3 The European equivalent of North American T3 transmits data at 34 368 Mbps up to 512 voice channels DSOs Equivalent to 16 E1 lines EMI Electromagnetic Interference Unwanted electrical noise present on a power line full duplex Data transmission in two directions simultaneously FXO Foreign Exchange Office Receives the ringing voltage from an FXS device Outside lines are connected to the FXO port on your TC400B card FXS Foreign Exchange Station Initiates and sends ringing voltage Phones are connected to the FXS ports on the TC400B card Page 30 Digium Inc Release 1 0 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms G 711 The International Telecommunications Union recommendation for an algorithm designed to transmit and receive mulaw PCM voice and A law at digital bit rate 64 Kbps This algorithm is used for digital telephone sets on digital PBX G 723 1 The Telecommunic
8. CONTENTS Chapter 1 a oana Me oso SecA Se NAAN Ra Wate es 11 What is Asterisk 0 0 cee eens 14 Chapter 2 Card Installation 0 cee eee eee eee eee 15 PA eh end aad a Deva A AA 15 Hardware Installation 0 0 0 0 ccc cee 17 Software Installation 18 Asterisk Zaptel 1 2 Installation 18 Chapter 3 Configuration i aneas bee A A ANA eae ee eee eas See 21 Testing Your configuration 21 Chapter 4 Questions and Answers 00e cece eee eee eens 23 Appendix A Specifications otsi eens ee ee eee eee Te ee eae 25 Appendix B Glossary and Acronyms 22 cee eee ees 27 Release 1 0 Digium Inc Page 9 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Table Of Contents List of Figures Sample Telco Application 12 Sample Network Application 13 TC400B Card san ya td GANA PBA AGA Haat daadaaageraaes 16 Insert the Card nnana naana ee eee ees 17 dmesg Output 0000 ee 18 Example show transcoder Result 22 List of Tables Maximum Power Consumption 26 Page 10 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Chapter 1 Overview The TC400B is a bundle of the half length low prof
9. Cat 5 cabling support applications up to 100 MHz Cat5E Category of Performance for wiring and cabling Category 5 Enhanced wiring supports signal rates up to 100 MHz but adheres to stricter quality specifications Page 28 Digium Inc Release 1 0 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms CLEC competitive local exchange carrier A term for telephone companies established after the Telecommunications Act of 1996 deregulated the LECs CLECs compete with ILECs to offer local service See also LEC and ILEC co central office The CO houses local switching equipment All local access lines in a particular geographic area terminate at this facility which is usually owned and operated by an ILEC CPE customer premises equipment Terminal equipment which is connected to the telecommunications network and which resides within the home or office of the customer This includes telephones modems terminals routers and television set top boxes DSO Digital Signal Level 0 A voice grade channel of 64 Kbps The worldwide standard speed for digitizing voice conversation using PCM Pulse Code Modulation DS1 Digital Signal Level 1 1 544 Mbps in North America T1 and Japan J1 up to 24 voice channels DSOs 2 048 Mbps in Europe E1 up to 32 voice channels DSOs DS1 T1 E1 lines are part of the PSTN DS3 Digital Signal Level 3 T3 in North
10. Digium Technical Support and possible resolutions Multiple resources are available to obtain more information about Asterisk and Digium products These resources are listed on page 23 Q My card can t seem to reach its full channel count why A Each call that uses the TC400B for transcoding requires two file handles Increase your limit for open files Q Asterisk issues errors such as rtp c Unable to allocate socket Too many open files How can I solve this A Each call that uses the TC400B for transcoding requires two file handles Increase your limit for open files Q Does my card take 1000 interrupts per second like my other Digium cards A The TC400b only takes interrupts when it is in a active transcoding state and will not pull interrupts when it is idling unlike other Digium hardware Release 1 0 Digium Inc Page 23 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 4 Questions and Answers Where can I ask even more questions There are several places to inquire for more information about Asterisk Digium products 1 Digium Technical Support 1 256 428 6161 is available 7am 7pm Central Time Monday Friday 2 Asterisk forums forums digium com 3 Asterisk users mailing list lists digium com 4 IRC channel asterisk on irc freenode net Page 24 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 8081
11. ation Standardization Sector ITU T algorithm for compressed audio over telephone lines at 6 3 or 5 3 Kbps G 729a An International Telecommunications Union standard for voice algorithm for encoding decoding at 8 Kbps H 323 An International Telecommunications Union standard for multimedia communications over packet based networks IAX Inter Asterisk eXchange A VoIP protocol used by Asterisk It is used to enable VoIP connections between Asterisk servers and between servers and clients that also use the IAX protocol iLBC internet Low Bitrate Codec A free speech codec used for voice over IP It is designed for narrow band speech with a payload bitrate of 13 33 kbps frame length 30ms and 15 2 kbps frame length 20 ms Release 1 0 Digium Inc Page 31 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms ILEC incumbent local exchange carrier The LECs that were the original carriers in the market prior to the entry of competition and therefore have the dominant position in the market interface A point of contact between two systems networks or devices ISO International Standards Organization LED light emitting diode Linux A robust feature packed open source operating system based on Unix that remains freely available on the internet It boasts dependability and offers a wide range of compatibility with hardware and software Asterisk is
12. common PC anyone can replace an existing switch or complement a PBX by adding VoIP voicemail conferencing and many other capabilities Asterisk will integrate with most standards based IP telephone handsets and software Analog phones and ADSI screen phones are also supported Page 14 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 2 Card Installation This chapter provides the following information m Hardware Installation on page 17 m Software Installation on page 18 When you unpack your card carefully inspect it for any damage that may have occurred in shipment If damage is suspected file a claim with the carrier and contact your reseller where the card was purchased or Digium Technical Support 1 256 428 6161 or toll free at 1 877 LINUXME Keep the original shipping container to use for future shipment or proof of damage during shipment Note Only qualified service personnel should install the card Users should not attempt to perform this function themselves Release 1 0 Digium Inc Page 15 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 2 Card Installation Keyed for 3 3 or 5 volt PCI Figure 3 TC400B Card Page 16 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 2 Card Installation Caution
13. d Installation Provides instructions for installing the card in your PC acquiring correct drivers and checking device compatibility 3 Configuration Provides examples for configuring options 4 Questions and Explains resolutions to common problems and Answers frequently asked questions pertaining to card installation and usage A Specifications Details card specifications B Glossary and Defines terms related to this product Acronyms Release 1 0 Digium Inc Page 5 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Symbol Definitions Caution statements indicate a condition where damage to the unit or its configuration could occur if operational procedures are not followed To reduce the risk of damage or injury follow all steps or procedures as instructed The ESD symbol indicates electrostatic sensitive devices Observe precautions for handling devices Wear a properly grounded electrostatic discharge ESD wrist strap while handling the device The Electrical Hazard Symbol indicates a possibility of electrical shock when operating this unit in certain situations To reduce the risk of damage or injury follow all steps or procedures as instructed gt hb gt Page 6 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Important Safety Instructions User Cautions Power Source The outlet should be installed near the equ
14. digium Asterisk TC400B User Manual January 26 2007 Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 digium Asterisk Digium Inc 2006 All rights reserved No part of this publication may be copied distributed transmitted transcribed stored in a retrieval system or translated into any human or computer language without the prior written permission of Digium Inc Digium Inc has made every effort to ensure that the instructions contained in this document are adequate and error free The manufacturer will if necessary explain issues which may not be covered by this documentation The manufacturer s liability for any errors in the documents is limited to the correction of errors and the aforementioned advisory services This document has been prepared for use by professional and properly trained personnel and the customer assumes full responsibility when using it Adobe and Acrobat are registered trademarks and Acrobat Reader is a trademark of Adobe Systems Incorporated Asterisk and Digium are registered trademarks and Asterisk Standard Edition is a trademark of Digium Inc Any other trademarks mentioned in the document are the property of their respective owners Page 2 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Safety Certification and Agency Approvals Safety UL 60950 1 2003
15. g bits one after the other Page 34 Digium Inc Release 1 0 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms telco A generic name which refers to the telephone companies throughout the world including RBOCs LECs and PTTs tip and ring The standard termination on the two conductors of a telephone circuit named after the physical appearance of the contact areas on the jack plug twisted pair Two copper wires commonly used for telephony and data communications The wires are wrapped loosely around each other to minimize radio frequency interference or interference from other pairs in the same bundle u law Also known as mu law is the PCM quasi logarithmic curve It is the 64 Kbps standard North America voice amplitude sample used for encoding decoding V volts VolP Voice over IP Technology used for transmitting voice traffic over a data network using the Internet Protocol Zaptel Zap Zapata Telephony Project dedicated to implementing a reasonable and affordable Computer Telephony platform into the world marketplace Release 1 0 Digium Inc Page 35 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Appendix B Glossary and Acronyms Page 36 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030
16. ile PCI 2 2 compliant TC400P base card and the TC400M voice processing module The TC400B is designed to handle in dedicated DSP resources the complex codec translations for highly compressed audio as would otherwise be processed by Asterisk in software Asterisk in software and with Digium G 729a licensing is capable of transforming the G 729a codec into other codecs for the purposes of call origination or termination bridging disparate calls or VoIP to TDM connectivity These transformations in software are very expensive in terms of MIPS and require a substantial amount of CPU time to accomplish The TC400B not only relieves the CPU of this duty freeing it up to handle other tasks or to complete additional call processing but also provides Asterisk with the capability of bridging G723 1 compressed audio into other formats a capability not previously possible The TC400P decompresses G 729a 8 0kbit or G 723 1 5 3kbit into u law or a law or compresses u law or a law into G 729a 8 0kbit or G 723 1 5 3kbit The TC400B is rated to handle up to 96 bi directional G 729a transformations or 92 bi directional G 723 1 transformations The TC400B does not require additional licensing fees for the use of these codecs nor does it require the registration process associated with Digium s software based G 729a codec licensing Release 1 0 Digium Inc Page 11 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 6
17. ipment and be easily accessible Applying Power Use only the power cord power supply and or batteries indicated in the manual Do not dispose of batteries in a fire The may explode Check with local codes for special disposal instructions Installation This card is for use only with compatible UL Listed computers that have Installation Instructions detailing installation of card cage accessories Servicing Do not attempt to service this card unless specifically instructed to do so Do not attempt to remove the card from your equipment while power is present Refer servicing to qualified service personnel Water and Moisture Do not spill liquids on this unit Do not operate this equipment in a wet environment Heat Do not operate or store this product near heat sources such as radiators air ducts areas subject to direct intense sunlight or other products that produce heat BBEBBBB Static Electricity To reduce the risk of damaging the unit or your equipment do not attempt to open the enclosure or gain access to areas where you are not instructed to do so Refer servicing to qualified service personnel p gt Save these instructions for future reference Release 1 0 Digium Inc Page 7 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Page 8 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 TABLE OF
18. ocol Type of communications link that connects a single device to another single device such as a remote terminal to a host computer PSTN public switched telephone network A communications network which uses telephones to establish connections between two points Also referred to as the dial network Release 1 0 Digium Inc Page 33 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 VolPon Appendix B Glossary and Acronyms Qos quality of service A measure of telephone service as specified by the Public Service Commission RJ11 A six pin jack typically used for connecting telephones modems and fax machines in residential and business settings to PBX or the local telephone CO SIP Session Initiation Protocol An IETF standard for setting up sessions between one or more clients It is currently the leading signaling protocol for Voice over IP gradually replacing H 323 T1 A dedicated digital carrier facility which transmits up to 24 voice channels DSOs and transmits data at 1 544 Mbps Commonly used to carry traffic to and from private business networks and ISPs T3 A dedicated digital carrier facility which consists of 28 T1 lines and transmits data at 44 736 Mbps Equivalent to 672 voice channels DSOs TDM time division multiplexer A device that supports simultaneous transmission of multiple data streams into a single high speed data stream TDM separates signals by interleavin
19. the program modprobe The appropriate driver for the TC400B card is wetc4xxp modprobe wctc4xxp 3 Confirm that the card was started successfully by running the dmesg command The screen output will be something similar to that shown in Figure 5 The text may vary slightly Page 18 Digium Inc Release 1 0 www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 2 Card Installation wetedxxp Wildcard TC400P TC400K supporting y 729a 9 723 1 S 3kbps with firmware version 56 Figure 5 dmesg Output 4 Go to www asterisk org and download asterisk version 1 2 15 or greater tar zxvf asterisk 1 X X tar gz cd asterisk 1 X xX make make install Note If the build fails it may be because you are missing one of the build dependencies the kernel source or development tools Feel free to contact your reseller where the card was purchased or call Digium Technical Support 1 256 428 6161 or toll free at 1 877 LINUXME for assistance Complete instructions for installing Asterisk are available at www asterisk org Release 1 0 Digium Inc Page 19 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 2 Card Installation Page 20 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 3 Configuration At this time no zaptel conf or zapata conf changes are necessary to u
20. tilize this card The mode module parameter may be used to specify which complex codes are allowed m mode mixed This default option will enable 92 calls of G729a or G 723 1 5 3Kbit m mode g729 This option will enable 96 calls of G729a m mode g723 This default option will enable 92 calls of G 723 1 5 3Kbit Testing Your configuration 1 Start Asterisk by typing asterisk VVVVC Release 1 0 Digium Inc Page 21 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 3 Configuration 2 Verify that the TC400B is registered with Asterisk by viewing the translation matrix CLI gt show transcoder An example of the show transcoder is shown in Figure 6 The text shown may vary slightly 0 0 encoders decoders of 92 channels G 729a G 723 1 5 3 kbps are in use Figure 6 Example show transcoder Result Note More detailed information is provided in the Asterisk User s Manual A copy may be requested by contacting Digium Technical Support 1 256 428 6161 ot toll free at 1 877 LINUXME or visiting the website at www digium com You may also contact your distributor or reseller where the card was purchased for assistance Page 22 Digium Inc Release 1 0 VolPon www voipon co uk sales voipon co uk Tel 44 0 1245 808195 Fax 44 0 1245 600030 Chapter 4 Questions and Answers This chapter provides frequently asked questions as identified from
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