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Sangoma Hardware and Open Source Asterisk IP/PBX

Sangoma Hardware and Open Source Asterisk IP/PBX. Konrad Hammel Software Engineer/Level 3 Tech Sangoma Technologies. Who is Sangoma?. -established in 1984 -publicly traded (TSXV:STC) -started with hardware for Open Source data routers -in the Linux Kernel since 1.01

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Sangoma Hardware and Open Source Asterisk IP/PBX

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  1. Sangoma Hardware and Open Source Asterisk IP/PBX Konrad Hammel Software Engineer/Level 3 Tech Sangoma Technologies

  2. Who is Sangoma? -established in 1984 -publicly traded (TSXV:STC) -started with hardware for Open Source data routers -in the Linux Kernel since 1.01 -device drivers, X.25, Frame Relay, MLPPP -award winning engineers -contributors to open source telephony -installed in 128 countries -VOICE QUALITY and RELIABILITY -Life Time Warranty

  3. What does Sangoma Manufacture? • Analog TDM cards • A200 • A400 • Digital TDM cards • A101/102/104/108 • A500 • Serial Cards • A142/A144 • ADSL Cards • S518/S519

  4. Sangoma’s Award Winning Design

  5. Reliable Faxing • Faxing from Digital to Analog = 2 different clocks • Sync the clocks to get reliable faxing • DSP is used to recover and pass clock

  6. Hardware Echo canceling • Octasic DSP module (same as the telco’s use) • 1024 taps = 128ms echo tails • Hardware DTMF • Noise reduction • Comfort noise injection • Tone detection for fax/modem pass through • Field upgradeable • Fully independent from system

  7. What is Echo? • Your audio stream reflected back to you • TX recorded and compared to RX • Delays of 16ms+ are picked up by the human ear • 3 main sources of echo • Compression • G.729 = ~15ms • Distance • Copper lines = ~1ms per 100 miles • Transcoding (TDM to IP) • Buffering = ~5-50ms

  8. Other Types of Echo • Acoustic Echo • Hybrid Echo • 4 wires down to 2 wires

  9. Current Architecture • Zaptel takes data from hardware and passes it to software transcoding if needed • Due to software EC 1ms chunks, but Asterisk takes 20ms • 8 bytes every 1ms from every span = A LOT of interrupts (1000)

  10. A500/SS7 and future Architecture • Removing Zaptel and it’s restrictions • Per card interrupt rather then per span • 80 byte chunks every 10ms per card = a lot LESS interrupts • Clustering/True Media Gateways

  11. Debugging Problems • Remember the OSI model, start low and move high • Check that hardware drivers start properly (/var/log/messages) • Check that hardware is running properly (ifconfig) • Make sure “ztcfg –vvv” has no complaints • Verify that Asterisk loads the proper Zap channels • Is the D-channel coming?

  12. Debugging Problems Cont’d • Use the following useful commands: • wanrouter hwprobe verbose • wanrouter status • wanpipemon –i wXg1 –c Ta • wanpipemon -i wXg1 –c astats –m Y • wanpipemon –i wXg1 –c trd • wanpipemon -i wXg1 –c ehw • wan_ec_client wanpipeX enable Y • wan_ec_client wanpipeX disable Y

  13. Debugging Problems Cont’d • cat /proc/interrupts • cat /proc/zaptel/X • zap show channels • pri show span X • pri intense debug span X

  14. Debugging Problems Cont’d • Don’t forget the log files! • /var/log/messages • /var/log/asterisk/messages • Use logger.conf to add or remove info from this file • /var/log/sangoma_mgd.log

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