[Freeswitch-users] zRTP + OPUS one-way audio issue
admin at smallunix.net
Fri Sep 21 10:47:02 UTC 2018
I'm facing an one-way audio issue with zRTP while using OPUS. zRTP is set
in passthru mode.
Called party can hear Calling party but not vice versa.
This issue is happening *only* with dynamic payloads codecs.
Everything is working fine if I use G722 or G729.
Scenario Leg-A (207) -> FS -> Leg-B (213)
Checking FS logs, I see
Actually having different payloads should not be an issue.
I opened a case to Acrobits, they said the issue is in the actual RTP
traffic sent to Leg-A from FS:
>From the client log Leg-A
Sending RTP packet #200 192.168.128.158:59176 > 184.108.40.206:28560,
This is using 103, correct as agreed on this side of the call
Received RTP packet #200 220.127.116.11:28560 > 192.168.128.158:59176,
This is using 102, which is wrong for this side of the call.
Seems that after negotiated payload 102 with Leg-B, FS is trying to use it
on Leg-A, where it should be used 102 instead.
FreeSWITCH Version 1.8.1-2-4f54cff~64bit (-2-4f54cff 64bit)
OS.: Debian 8.11
Linux pbx-186 3.16.0-4-amd64 #1 SMP Debian 3.16.51-3 (2017-12-13) x86_64
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