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Teams use the Silk protocol which is proprietary to Microsoft. This protocol is encrypted by default. Wireshark cannot be used to listen to these calls although you can see the RTP packets in a trace. The only place where you would be able to listen to these calls is, if it was transcoded from Silk to either G.711A, G.711U or G.729 by an SBC (Session Border Controller) on its way to the Service provider. Just a note Teams uses the following: UDP port 3479 (Audio), 3480 Video, 3481 Screen sharing. 3479 goes with any port between 50 000 and 50019 (Voice) 3480 goes with any port between 50020 and 50039 (Video) 3481 goes with any port between 50040 and 50059 (Screen sharing)
If any of the above ports are blocked by a firewall it will use 3478
