But you can forge a SIP INVITE carrying the necessary SDP, populating the SDP with information matching the destination of your RTP flow (connection socket, codec list and codec parameters), capture that packet, edit its frame time before merging chronologically with your original capture, and merge it with it. To my best knowledge, there is no way to tell Wireshark how to treat a particular dynamic payload type using any Wireshark configuration. As the RTP timestamp contents differs depending on the payload type, and the payload type for your L16 capture is dynamic, the RTP analysis doesn't know the meaning of the RTP timestamps in it and so cannot compare frame timestamps (assigned during capture) to RTP timestamps in order to evaluate jitter etc.
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