Stefan Sayer writes:

> > What kind of tests show bad audio quality if the above change is made?

> try calling into the echo or conference app from e.g. baresip. What
> you'll see is that the PLC functions are called all the time because
> there's audio 'missing'.

I tried echo and didn't notice any problems with voice quality. No error
message showed up in syslog or baresip console:

call: connecting to 'sip:[email protected]'..
call: SIP Progress: 100 Trying (/)
call: SIP Progress: 100 Trying (/)
audio: Set audio decoder: opus 48000Hz 2ch
audio: Set audio encoder: opus 48000Hz 2ch
audio tx pipeline:        alsa ---> opus
audio rx pipeline:        alsa <--- opus
[email protected]: Call established: sip:[email protected]
Quit0:47] audio=99421/26008 (bit/s)
Stopping 1 useragent.. 
sip:[email protected]: Call with sip:[email protected] terminated 
(duration: 47 secs)

audio           Transmit:     Receive:
packets:           2373         2359
avg. bitrate:      96.0         24.0  (kbit/s)
errors:               0            0

I can try conference tomorrow.

If channels=1 works for you and 2 does not, then I would suggest that
even when channels=1, sems would still be made to generate correct
rtpmap line with /2, but without fmtp stereo line.

-- Juha
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