WNSRP support?

Hello, I have captured a mobile link using wireshark application. The file is a Sip conversation for a video call using WNSRP instead of h245 for its control channel. When I see the capture file analysis and use the filter h245, four h245 messages have been found; in their Information field it says terminalCapabilitySet, MasterSlaveDetermination, and vendorIdentification messages is detected. No more h245 messages are found, so openLogicalChannel and multiplexEntrySend messages is not available. Does it depend on WNSRP usage that the wireshark application cannot detect these messages or it means that the connection does not exchange this information at all? Regards