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Hi Allan,
<br>
<br>
this is a very simple logical bug which exists in Asterisk (and
<br>
apparently in FreeSwitch).
<br>
If you allow for multiple codecs, Asterisk will just start with one, but
<br>
once it gets a frame from the other side with a different codec, it will
<br>
switch to that codec. If both sides do that, they start with different
<br>
codecs and the latency is high enough, they'll get semi-stuck in a codec
<br>
switching loop until one frame gets lost.
<br>
<br>
The proper bugfix would be to keep the codec choice "sticky" and not to
<br>
change the codec on every packet. (e.g. wait for n packets with a new
<br>
codec before you change to that codec) One side doing that should solve
<br>
the problem.
<br>
<br>
The workaround, as mentioned before, is to limit the codecs you speak,
<br>
but that will likely give you other slight problems regarding voice quality.
<br>
<br>
Bye
<br>
Christian Berger
<br>
<br>
<br>
Am 26.09.21 um 22:23 schrieb Allan Kristensen:
<br>
<font color="#000000">> Hello,
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> We are getting these weird log messages from FS and I'm a little
</font><br>
<font color="#000000">> uncertain what they are (there are thousands being logged), can someone
</font><br>
<font color="#000000">> clarify?
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.849 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.844181
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMU
</font><br>
<font color="#000000">> (payload type 0).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.749 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.744202
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMA
</font><br>
<font color="#000000">> (payload type 8).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.669 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.664168
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMU
</font><br>
<font color="#000000">> (payload type 0).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.569 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.564190
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMA
</font><br>
<font color="#000000">> (payload type 8).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.489 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.484194
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMU
</font><br>
<font color="#000000">> (payload type 0).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.389 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.384180
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMA
</font><br>
<font color="#000000">> (payload type 8).
</font><br>
<font color="#000000">> September 23rd 2021, 10:35:40.309 ms-euc1-1a
</font><br>
<font color="#000000">> 28423364-1c49-11ec-b0ec-e3438dde9495 2021-09-23 08:35:40.304190
</font><br>
<font color="#000000">> [WARNING] switch_core_media.c:3305 Changing current codec to PCMU
</font><br>
<font color="#000000">> (payload type 0).
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> I'm thinking it's because we are receiving RTP packets with both types
</font><br>
<font color="#000000">> from remote?
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> It only happens for a specific provider, so I'm thinking it's them, I
</font><br>
<font color="#000000">> just need to tell them the problem is.
</font><br>
<font color="#000000">> During codec negotiations we offered PCMA + PCMU and the SDP response
</font><br>
<font color="#000000">> from them also had PCMA + PCMU, that means we can choose what we want
</font><br>
<font color="#000000">> right? not that they should send us both? ;-)
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> Thank you...
</font><br>
<font color="#000000">> Allan
</font><br>
<font color="#000000">>
</font><br>
<font color="#000000">> _________________________________________________________________________
</font><br>
<font color="#000000">>
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</font><br>
<font color="#000000">>
</font><br>
<BR />
<BR />
Christian Berger<br><br><br> <img src="cid:0eb5f48c.e33a6fec.jpg.61502498" width="119" height="64"><br><br>foncloud GmbH & Co KG<br>Hahlweg 2a<br>36093 Künzell<br><br>Tel: / <br>Fax: +49 661 968990-99<br><br><!--[if gte mso 9]><xml>
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