I use Unity as a simple IVR, it allows an incoming caller to select an extension and Unity then does a "release to switch" transfer. That all works fine and did on IOS 12.1.x. I upgraded the IOS to 12.2.7 and now I don't get any audio from the IP Phone back to the outside call thru the gwy. You can hear the call on the IP phone from the outside call OK however.
There are no problems calling direct to an external number through the gateway, so it is something to do with the transfer from Unity.
The config is very simple - see below, any help much appreciated.
The config looks okay. You say the call works okay when you call directly out the gateway you only have the problem when transfer out of Unity. Is there a DID associated with that phone so you can call directly into the IP phone bypassing the Unity AA? When you call through the Unity AA to the IP phone trying running debug voip rtp. This command replaced debug cch323 rtp. You will see R's and X's which represent transmit and recieve. You will want to see capital letters this should indicate it is working. Let me know the what you get with this debug. I am a little confused about who can hear and who cannot. Can the PSTN hear or the IP phone hear. Can you also look at the IP phone when the call is up hit the I button twice. You will get call statistics. Are you transmiting and receiving packets?
If all you did was upgrade the IOS. And reverting to the previous IOS gives you full duplex communication. In my opinion you are running into a software bug. Please open a TAC case so that this can be troubleshoot and the appropriate information routed to engineering in order to get a fix for this problem.
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