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Snom 370 one way audio issue


I am using a snom 370 (snom370-SIP and an M9r (9.6.12-a) with Asterisk 13 (PJSIP only) and experience one way audio on calls bridged with chan_mobile. So everything else works (all combinations of PJSIP, DAHDI and IAX) but incoming audio from chan_mobile to a snom phone does not. I have tried various codec combinations, symmetric rtp, disabling RTCP with no luck. This only happens with the snoms, i do get audio when using X-Lite.

I have captured traffic, rtp packets reach the snom phones. I am attaching the log of the 370. My question is about the last line:

19/12/2015 13:48:55 [DEBUG0] PHN: SIP: Response CallStats 23749 (2) state terminated: Rx Total_Rx_Pkts=3340,Rx_Pkts=0,Rx_Pkts_Lost=0,Remote_Rx_Pkts_Lost=0, Tx Total_Tx_Pkts=504,Tx_Pkts=504,Remote_Tx_Pkts=3333


Although total_rx_pkts is 3340, rx_pkts is zero. Any suggestions on which settings can filter out received packets?


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Best Answer

I'm solve this with set rtp packet size from 100ms to 20ms. Try it.

1 person has this question

Have same problem with snom870. I have snom D715 and D765 - it's work. 

Problem start with update asterisk from 1.8 to 13.7.2.

When I take tcpdump on my snom870 and open in wireshark - I hear incoming audio, but my handset stay silent.

Please help!

similar experience here with Snom D725,,,



I'm solve this with set rtp packet size from 100ms to 20ms. Try it.

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