In attach the logs i capture for the User A add the PSTN callee and then also the log of the user that receive and produce bad audio.
Please let me know if are enough or i need to capture with Winshark.
sip-communicator0.pcap (45.2 KB)
sip-communicator0.log.0 (116 KB)
sip-communicator0.log.0.lck (87 Bytes)
sip-communicator0.log.0_bad (90.6 KB)
sip-communicator0.pcap_bad (21.9 KB)