Call Audio glitchy

[magnus]

I have a customer running 5.1.0.20 as part of a 7 node setup.
All calls are directed to the main node for the auto attendant.

Recently the calls have started to be glitchy.

"All calls, in house, incoming, and outgoing…. They sound like the person you are talking to are falling out of the service area and the caller cuts in and out."

They are using 8528 Phones with a newer building.

I have reset the 5000 and it did not improve call quality.
My main concern is that internal calls are being affected.

Any thoughts?

[dwayneg]

When you say "all calls", are you including intercom calls within the same site? Or only calls that traverse the network problematic?  Usually what you describe only affects network calls and point to a network issue.  But if calls within the same site are affected you'd be looking at serious issues within that controller.

[DND ON]

If the network will support it, try changing the Speech Encoding Setting from G.729 to G.711.

[magnus]

Changing the codec seems to have fixed it.
Thank you!