In the previous few attempts to capture Skype use IP via Wireshark, I have used the filter udp.srcport==36327, with 36327 being my Skype port.
Recently, I had an experience when another user could not see Skype conversation at all via the Skype port. The voice call via Skype was generating a ton of UDP segments, but all of them going through what appeared to be Microsoft server (IP 104.44.195.138) from UDP local port 28450, with STUN protocol assisting with the conversation
Filtering for UDP port 36327 (manually set in Skype settings) showed no packets leaving that port during the entire 4 minute Skype voice conversation
So, it appears that voice conversation via Skype goes through the some other service or some other VoIP service, other than Skype's own port.
Recently, I had an experience when another user could not see Skype conversation at all via the Skype port. The voice call via Skype was generating a ton of UDP segments, but all of them going through what appeared to be Microsoft server (IP 104.44.195.138) from UDP local port 28450, with STUN protocol assisting with the conversation
Filtering for UDP port 36327 (manually set in Skype settings) showed no packets leaving that port during the entire 4 minute Skype voice conversation
So, it appears that voice conversation via Skype goes through the some other service or some other VoIP service, other than Skype's own port.
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