State of knowledge

October 2020

Observation

If a softphone call is in progress, the voice transmission stops after 15 minutes.

However, ProCall Enterprise still shows the call as active.

Possible reason

This situation may be related to the PBX configuration.

Solution

In the Alcatel OmniPCX Office under Voice Parameters/SIP trunk lines, there is the menu item RTP Proxy: Fixed Ports.
This item must be set so that the telephone system always uses the same port.