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snom 320 G711 not working


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we have more than 25 snom 320 phones and with all we have a audio problem, for the Phone we use G711

We call the voicebox and the sound is very bad also the voice from a caller in the other direction to the caller the voice quality is good.


We do a little bit testing of codecs and firmwares

We switch the codec to G729A and the voice quality is good no problem in two directions also the audio from the voicebox is good.


We test also different firmware version 8.4.35 / and all have the same bad voice quality.

Other phones snom 710 etc work without problems on the same pbx Version: 5.2.3 (Debian64) and network ?
Any idea why G711 is not working on the snom 320 phones
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