I put the port on my Cisco 7945G phone into promiscuous mode so that my laptop see all traffic to/from the phone. When I make a call I see a big stream of traffic from the phone to the voice gateway. See example packet below. This must be RTP traffic. But wireshark is not classifying as such just seeing it as UDP traffic. I am sure that these UDP packets are carrying voice. When I go into Telephony/RTP Streams Wireshark says it sees no RTP streams. Telephony/Voip Calls likewise yields nothing. Why is wireshark not perceiving the voice traffic as expected? Thanks!
336 09:56:36.912318 10.10.34.50 10.10.36.6 UDP Source port: 28176 Destination port: 16486