Hi all,
sometimes calls from ToIP trunk to our internal VoIP phones, via an Asterisk B2BUA, have troubles with audio. Caller doesn’t hear any sound and seems to be related to codecs.
ToIP trunk use only G.729 (and maybe G.711) codec and all our phones were configured to use G.729 as primary choice for calls.
Seems that the codec handshake works correctly but i’m asking if a much-more-expert than me 
see somethiong wrong in my Asterisk config.
I’ve enabled “debug” log on my Asterisk and here’s the piece of log of a failed call:
pbx_variables.c: Function CALLERID(num) result is 'YYYYYYYY'
pbx_variables.c: Result of 'EXTEN' is '+39XXXXXX'
pbx.c: Launching 'NoOp'
pbx_variables.c: Result of 'EXTEN' is '+39XXXXXX'
pbx.c: Launching 'Dial'
app_dial.c: PJSIP/toip-00006a82: Data: PJSIP/+39XXXXXX@voip
chan_pjsip.c: +39XXXXXX@voip Topology: <0:audio-0:audio:sendrecv (g729)>
chan_pjsip.c: voip
channel_internal_api.c: <initializing>: Formats: (none)
channel_internal_api.c: Channel is being initialized or destroyed
stasis.c: Creating topic. name: channel:1651743237.28215, detail:
stasis.c: Topic 'channel:1651743237.28215': 0x7f4f20013a40 created
channel.c: Channel 0x7f4f200398e0 'PJSIP/voip-00006a83' allocated
chan_pjsip.c: Topology: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)> Formats: (g729|g722|alaw|ulaw)
chan_pjsip.c: Compatible? yes
channel_internal_api.c: PJSIP/voip-00006a83: MultistreamFormats: (g729|g722|alaw|ulaw)
channel_internal_api.c: Set native formats but not topology
channel_internal_api.c: PJSIP/voip-00006a83: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)>
channel_internal_api.c: Used provided topology
chan_pjsip.c:
chan_pjsip.c: Channel: PJSIP/voip-00006a83
chan_pjsip.c: PJSIP/voip-00006a83 Topology: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)>
chan_pjsip.c: 'call' task pushed
app_dial.c: PJSIP/toip-00006a82
channel.c: Channel PJSIP/voip-00006a83 setting read format path: g729 -> g729
channel.c: Channel PJSIP/toip-00006a82 setting write format path: g729 -> g729
channel.c: Channel PJSIP/toip-00006a82 setting read format path: g729 -> g729
channel.c: Channel PJSIP/voip-00006a83 setting write format path: g729 -> g729
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Connected line update
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Ringing
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
app_dial.c: PJSIP/voip-00006a83 answered PJSIP/toip-00006a82
app_dial.c: PJSIP/toip-00006a82: Answered by PJSIP/voip-00006a83
channel.c: Channel PJSIP/voip-00006a83 setting read format path: g729 -> g729
channel.c: Channel PJSIP/toip-00006a82 setting write format path: g729 -> g729
channel.c: Channel PJSIP/toip-00006a82 setting read format path: g729 -> g729
channel.c: Channel PJSIP/voip-00006a83 setting write format path: g729 -> g729
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c:
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Stop generators
chan_pjsip.c: PJSIP/toip-00006a82
stasis.c: Creating topic. name: bridge:all/bridge:a2c39a67-af9c-4063-8aa7-2bcedbce52a9, detail:
stasis.c: Topic 'bridge:all/bridge:a2c39a67-af9c-4063-8aa7-2bcedbce52a9': 0x7f4f200380f0 created
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9' can not use native RTP bridge as two channels are required
bridge.c: Bridge technology native_rtp is not compatible with properties of existing bridge.
bridge.c: Bridge technology holding_bridge does not have any capabilities we want.
bridge.c: Bridge technology softmix has less preference than simple_bridge (10 <= 50). Skipping.
bridge.c: Chose bridge technology simple_bridge
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling simple_bridge technology constructor
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling simple_bridge technology start
stasis_bridges.c: Update: 0x7f4f20012158 Old: <none> New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f20012158 Old: <none> New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
bridge_channel.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: 0x7f4f20033820(PJSIP/toip-00006a82) is joining
bridge_channel.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: pushing 0x7f4f20033820(PJSIP/toip-00006a82)
stasis_bridges.c: Update: 0x7f4f20004118 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f20004118 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Checking compatability for channels 'PJSIP/voip-00006a83' and 'PJSIP/toip-00006a82'
chan_pjsip.c: PJSIP/voip-00006a83 Native formats (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/toip-00006a82 Native formats (g729)
chan_pjsip.c:
bridge_native_rtp.c: Symmetric ptimes on the two call legs (0). May be able to native bridge in RTP
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9': Packetization comparison success between RTP streams (read_ptime0:20 == write_ptime1:20 and read_ptime1:20 == write_ptime0:20).
bridge.c: Bridge technology simple_bridge has less preference than native_rtp (50 <= 90). Skipping.
bridge.c: Bridge technology holding_bridge does not have any capabilities we want.
bridge.c: Bridge technology softmix does not have any capabilities we want.
bridge.c: Chose bridge technology native_rtp
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling native_rtp technology constructor
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: moving 0x7f4f20038240(PJSIP/voip-00006a83) to dummy bridge temporarily
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: 0x7f4f20038240(PJSIP/voip-00006a83) is leaving simple_bridge technology (dummy)
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling simple_bridge technology stop
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: 0x7f4f20033820(PJSIP/toip-00006a82) is joining native_rtp technology
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Channel 'PJSIP/toip-00006a82' is joining bridge tech
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Attaching hook data 0x7f4f20037b70 to 'PJSIP/toip-00006a82'
channel.c: PJSIP/voip-00006a83: Topologies already match. Current: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)> Requested: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)>
channel.c: PJSIP/voip-00006a83: Topologies already match. Current: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)> Requested: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)>
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: 0x7f4f20038240(PJSIP/voip-00006a83) is joining native_rtp technology
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Channel 'PJSIP/voip-00006a83' is joining bridge tech
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Attaching hook data 0x7f4f20011fe0 to 'PJSIP/voip-00006a83'
channel.c: PJSIP/voip-00006a83: Topologies already match. Current: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)> Requested: <0:audio-0:audio:sendrecv (g729|g722|alaw|ulaw)>
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Tech starting 'PJSIP/toip-00006a82' and 'PJSIP/voip-00006a83' with target 'none'
chan_pjsip.c: PJSIP/toip-00006a82 Native formats (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/voip-00006a83 Native formats (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/toip-00006a82 (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/voip-00006a83 (g729)
chan_pjsip.c:
channel.c: PJSIP/toip-00006a82: Topologies already match. Current: <0:audio-0:audio:sendrecv (g729)> Requested: <0:audio-0:audio:sendrecv (g729)>
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling native_rtp technology start
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: calling simple_bridge technology destructor
stasis_bridges.c: Update: 0x7f4f2003f288 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f2003f288 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Media SSRC change
chan_pjsip.c: PJSIP/toip-00006a82
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Checking compatability for channels 'PJSIP/toip-00006a82' and 'PJSIP/voip-00006a83'
chan_pjsip.c: PJSIP/toip-00006a82 Native formats (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/voip-00006a83 Native formats (g729)
chan_pjsip.c:
bridge_native_rtp.c: Symmetric ptimes on the two call legs (0). May be able to native bridge in RTP
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9': Packetization comparison success between RTP streams (read_ptime0:20 == write_ptime1:20 and read_ptime1:20 == write_ptime0:20).
bridge.c: Bridge technology simple_bridge has less preference than native_rtp (50 <= 90). Skipping.
bridge.c: Bridge technology holding_bridge does not have any capabilities we want.
bridge.c: Bridge technology softmix does not have any capabilities we want.
bridge.c: Chose bridge technology native_rtp
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9 is already using the new technology.
stasis_bridges.c: Update: 0x7f4f2000e2c8 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f2000e2c8 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
res_rtp_asterisk.c: (0x7f4f080fdbc0) RTP ooh, format changed from none to g729
res_rtp_asterisk.c: (0x7f4f080fdbc0) RTCP starting transmission
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Checking compatability for channels 'PJSIP/toip-00006a82' and 'PJSIP/voip-00006a83'
chan_pjsip.c: PJSIP/toip-00006a82 Native formats (g729)
chan_pjsip.c:
chan_pjsip.c: PJSIP/voip-00006a83 Native formats (g729)
chan_pjsip.c:
bridge_native_rtp.c: Symmetric ptimes on the two call legs (0). May be able to native bridge in RTP
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9': Packetization comparison success between RTP streams (read_ptime0:20 == write_ptime1:20 and read_ptime1:20 == write_ptime0:20).
bridge.c: Bridge technology simple_bridge has less preference than native_rtp (50 <= 90). Skipping.
bridge.c: Bridge technology holding_bridge does not have any capabilities we want.
bridge.c: Bridge technology softmix does not have any capabilities we want.
bridge.c: Chose bridge technology native_rtp
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9 is already using the new technology.
stasis_bridges.c: Update: 0x7f4f2001cf08 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f2001cf08 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
channel.c: Dropping duplicate answer!
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Private Cause Code
chan_pjsip.c: PJSIP/toip-00006a82
bridge_channel.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: pulling 0x7f4f20033820(PJSIP/toip-00006a82)
bridge_channel.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9: 0x7f4f20033820(PJSIP/toip-00006a82) is leaving native_rtp technology
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Channel 'PJSIP/toip-00006a82' is leaving bridge tech
bridge_native_rtp.c: Bridge 'a2c39a67-af9c-4063-8aa7-2bcedbce52a9'. Detaching hook data 0x7f4f20008188 from 'PJSIP/toip-00006a82'
bridge_native_rtp.c: Destroying channel tech_pvt data 0x7f4f20037b70
stasis_bridges.c: Update: 0x7f4f20037798 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
stasis_bridges.c: Update: 0x7f4f20037798 Old: a2c39a67-af9c-4063-8aa7-2bcedbce52a9 New: a2c39a67-af9c-4063-8aa7-2bcedbce52a9
bridge.c: Bridge a2c39a67-af9c-4063-8aa7-2bcedbce52a9 is dissolved, not performing smart bridge operation.
chan_pjsip.c: PJSIP/toip-00006a82: Indicated Media SSRC change
chan_pjsip.c: PJSIP/toip-00006a82
app_dial.c: Exiting with DIALSTATUS=ANSWER.
app_dial.c: PJSIP/toip-00006a82: Done
pbx.c: Spawn extension (from-toip,+39XXXXXX,2) exited non-zero on 'PJSIP/toip-00006a82'
channel.c: Soft-Hanging (0x10) up channel 'PJSIP/toip-00006a82'
channel.c: Channel 0x7f4f0820b380 'PJSIP/toip-00006a82' hanging up. Refs: 2
chan_pjsip.c: PJSIP/toip-00006a82
chan_pjsip.c: AST hangup cause 16 (no match found in PJSIP)
chan_pjsip.c: Cause: 0
on the voip phone (called), here’s the INVITE BODY received:
v=0
o=- 164455675 164455675 IN IP4 [Asterisk B2BUA IP]
s=Asterisk
c=IN IP4 [Asterisk B2BUA IP]
t=0 0
m=audio 14766 RTP/AVP 18 9 8 0 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv
Thanks for any help!
Michele