We are using a UCM6308 and experiencing a voice lag with incoming external SIP calls that are being transferred to another internal number. The transfers are both manual and automatic.
We are able to replica the issue by calling from a cell phone to a SIP DID that is routed to an UCM extension. The conversation with the initial extension is fine and there no delay or lag with the voice. The problem occurs when the call is transferred to another internal number then we are experiencing a delay or lag in the voice.
This calls are either manually transferred or transferred automatically via a forwarding setup.