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Setting G722 as top preferred codec on Polycom Phones


clarity
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Tested with Polycom Phones (IP-650) (IP-670) and IP330

If I change the top (preferred codec) to be G722 in PBXNSIP..

Either globally (settings)

-or at the individual account..

 

G722 calls work great between supported phones and to PBXnsip IVR/Voicemail prompts.

 

However all calls break to other phones that do not support G722 such as Polycom IP-330

or to the PSTN gateway which is G.711

 

This is not expected behavior.

I'd expect if one leg of a call.. be it another phone that does not support G722 or the PSTN Gateway (G711 only)

should cause both legs of the call to fall back to the common accepted codec (g711).

 

This is not happening... the IP 650's and 670's are still showiing "HD" in the display and get NO audio

with the other end of the call which is G711.

 

G722 phones sem to 'have no clue' that the far end is not supporting G722.

 

I can provide packet traces if needed.

 

Our test box is on Debian4/Intel Xeon.

 

3.1.0.3043 (Linux)

License Status: Demo License (3 Minutes)

License Duration: Permanent

Additional license information:

 

 

 

 

Thanks!

 

Steve

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Tested with Polycom Phones (IP-650) (IP-670) and IP330

If I change the top (preferred codec) to be G722 in PBXNSIP..

Either globally (settings)

-or at the individual account..

 

G722 calls work great between supported phones and to PBXnsip IVR/Voicemail prompts.

 

However all calls break to other phones that do not support G722 such as Polycom IP-330

or to the PSTN gateway which is G.711

 

This is not expected behavior.

I'd expect if one leg of a call.. be it another phone that does not support G722 or the PSTN Gateway (G711 only)

should cause both legs of the call to fall back to the common accepted codec (g711).

 

This is not happening... the IP 650's and 670's are still showiing "HD" in the display and get NO audio

with the other end of the call which is G711.

 

G722 phones sem to 'have no clue' that the far end is not supporting G722.

 

I can provide packet traces if needed.

 

It would be interesting to see where the problem is. I know that for a phone it can be tricky to dynamically switch between 8 kHz and 16 Khz; especially when the phone advertizes 16 kHz in the beginning then receives 8 kHz. Wideband is still a little bit bleeding edge.

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