T19 / T19P call disconnection with Matrix Eternity

[fernando.lagper]

Hello.

Good day to you.

A few of my partners are complaining lately from sudden call disconnections on their yealink phones with our Matrix Eternity IPPBX family (it doesn't matter which Eternity firmware version). It happens around 2m55s in the conversation.

I have taken a debug and a pcap files and I have found that the phone itself
is sending a "CANCEL" request to the PBX as per the PCAP file attached
in the middle of the conversation, without any prior PBX request.

I see in the debug trace the following message just before the "cancel" packet.
"release_aborted_calls remove a dialog for an unfinished transaction".

I do not know what causes this message or this behavior.
Can you help me to fix this?.

T19P firmware: 31.71.0.39