Forum Discussion

Brass Contributor

Oct 25, 2017

Cloud PBX only uses G711 codec on Polycom, can't change to anything else

Our users are complaining that calls using Polycom VVX 501 phones (with the latest firmware, 5.6.0.17325) sound much worse than calls through the desktop Skype app. We're not 100% sure how to debugg ...

Iron Contributor

Oct 25, 2017

Hi Nicholas,

It's currently on the Polycom VVX roadmap to add the SILK audio codec (which is predominantly the codec used in SfB Online). This is the codec Microsoft picked up in the Skype consumer acquisition.

Check out the following blog that covers what codecs to keep on VVX phones and what can be removed:

http://www.uccramblings.com/vvx-codecs-issues-with-skype-for-business/

Hope this helps,

Damien

Nicholas Semenkovich

Brass Contributor

Nov 07, 2017

Thanks -- though still unlear why Polycom phones with Skype for Business Online / Cloud Voice / Cloud PBX only seem to support PSTN calling with G.711 (they won't use G.722 at all).

(And Polycom supports Opus -- which the SILK codec was rolled into -- I would be surprised if they ever added support for SILK.)

Damien Margaritis
Iron Contributor
Nov 07, 2017
Based on the following screen grab (sandbox feature at the moment, NOT on GA code), they will:
- Nicholas Semenkovich
  Brass Contributor
  Nov 14, 2017
  Whoa; cool find!
  
  Still odd that we can't call using anything but G.711 (and that the PrioritizedCodecsList preference for G.722 is essentially ignored).
  - Nicholas Semenkovich
    Brass Contributor
    Nov 28, 2017
    Just updating this thread; we still can't get our Polycoms to use any codec other than G.711; and our users are complaining a lot about poor call quality.
    
    Has anyone been able to get the PrioritizedCodecsList to work (that is, to prefer G.722, or use any other codec?)?