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Need help analyzing VOIP traffic

We have Mitel VOIP phones talking on there own VLAN at my organization. VOIP traffic that has to cross over a 10 gig fiber link between two HP 5900 AF switches has intermittent packet loss and jitter causing voice quality issues. I need to analyze the traffic. From my desk I start the wireshark capture on my Ethernet interface. I make a call with the VOIP phone and then stop the capture after the call is disconnected. I click on Telephony but I get no information on the call I made. Probably need some basic help on setting this up.