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Nicholas Semenkovich's avatar
Nicholas Semenkovich
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 ...
Cloud PBX
devices
PSTN Calling
Nicholas Semenkovich's avatar
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's avatar
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's avatar
    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's avatar
      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?)?

       

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