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Codec / payload one way audio issue


Ashweb1
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Newbie here.. although I have experience with other VOIP platforms, Linux and networking etc

My Kazoo install is working great.. calls between extensions, outbound calls through my upstream provider gateway all good.

However when I call in I do not hear a ringing tone on my mobile and when I answer the call on the internal extension I cannot hear the audio on my mobile and my audio sounds like I'm down a well with a tin can attached with string.

The error I get in the log is as follows:

faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:04.800401527Z [WARNING] switch_core_media.c:3322 Changing current codec to PCMA (payload type 8).
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:04.960792349Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:04.980708096Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.000829585Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.060773316Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.080873026Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.100906118Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.120834624Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.140798600Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.160757778Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...
faf27a10-b998-1239-1ea9-005056a5faca 2020-12-15T16:54:05.180842942Z [WARNING] switch_core_media.c:3334 Could not change to payload type 0, ignoring...

This is repeated over and over whilst the call progresses and is answered.

Any help or suggestions much appreciated!

If more information is required let me know.

Ash

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Hi Ash,

First, welcome! Glad you're here!

I would start by looking at the SDP in the A-leg's INVITE to see codecs offered, as well as what codecs are then offered to the B-leg from FreeSWITCH. Could be a transcoding issue or misconfigured codec selection.

Payload type 0 is typically PCMU but you're log shows PCMA being used. Perhaps look into what codecs FreeSWITCH thinks are loaded? `fs_cli -x 'show codecs'` should list `codec,G.711 ulaw,CORE_PCM_MODULE` among others.

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Hello Mc,

Both ulaw and alaw codecs are loaded - my upstream provider supports both whichever is offered.

After a conversation with my provider they informed me that although they support both Alaw and Ulaw, they only expect to be offered one at once.

This is working now, thank-you for your help :)

Ash

Edited by Ashweb1
Correct my response (see edit history)
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