filter the RTP packets

"Leung Leo" <[email protected]>
Newsgroups gmane.network.ethereal.user
Message-ID <CBB1F621552A5D408FD95A3747B928AE5BF910@hggksmail01.ap.thmulti.com>
Dear Sir/Madam,

I  filtered the RTP packets from the original trace file and saved  to another file, but there is only shown the UDP packets in filtered file.
How can I keep the RTP packet in filtered file?  

best regards,
leo
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