Bad echo on auto provisioned Polycom 301

[TSDKen]

I finally got my 3cx v7 running with a test Polycom 301 SIP phone and a laptop running the 3CX client. I am getting a very bad echo in the handset of the polycom. Any ideas why this is happening and what I can do to fix it? Not sure if this helps, but the phone worked just fine on a trixbox install.

Thanks,

Ken

 

[TSDKen]

I have my polycom and my laptop in two separate rooms, so I do not think this is the issue. I will try another polycom phone and see how it does.

 

[instantexpert]

I'm getting pretty bad echo on my Polycom 560 test unit. I haven't done much in the way of diagnostics yet, though. The interesting thing is the echo is *only* on the Polycom end. The person on the other end has no problems with call quality.

I have "PBX Delivers audio" turned off and I'm running 3CX V7 with auto-provisioning.

 

[William400]

Hi

Can you please try to change the RTP codec priority to G729 / G711u / G711a ?

We have had 1 other report about this, which was solved as above however we are unable to reproduce in house.

Please advise outcome.

 

[instantexpert]

I presume you mean, change the settings in the phone itself. Will this be automatically setup in a future provisioning update?

 

[instantexpert]

Hi

Can you please try to change the RTP codec priority to G729 / G711u / G711a ?

We have had 1 other report about this, which was solved as above however we are unable to reproduce in house.

Please advise outcome.

I went to the phone web page -> General -> Audio Processing and changed to:

G.729AB / G.711MU / G.711A / G.722

According to my test engineer (the boss) the call quality was worse today. Unfortunately, this is not a scientific result and I'm having him go back and test

G.722 / G.711MU / G.711A / G.729AB (the default)

to see if things go back to the way they were.

 

[instantexpert]

These problems are so aggravating...

The Polycom hasn't echoed at all today and my call quality issues appear to be a result of a poor link back to my provider. I'll update if I find out more.