[cisco-voip] 9971 echo on speakerphone

[Eric Pedersen]

We are having intermittent problems with echo on calls to 9971 phones on speaker.  I've been able to reproduce this, but not consistently and it seems to only occur on some calls, primarily internal though I suppose PSTN calls may be having the same problem but the gateway DSPs are suppressing it.  Basically when someone calls me on my 9971 and I take the call on speakerphone they hear their own voice echoing and background HVAC noise.  It seems like the built-in echo canceller is not working when this happens.  I've tried different phones in the same physical space with the problem occurring on some but not others so I don't think it's the room layout.  Has anyone else seen anything like this?

Thanks,
Eric

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