Decoding RTP packet - Unknown RTP version 0

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I am trying to analyze a packet file that is a capture of video conversation. However, I do not understand some of the packets decoded by Wireshark. It looks like STUN packets but Wireshark decodes it as RTP packets with info showing "Unknown RTP version 0". How to analyze these RTP packets as STUN packets?

55  18.898682   10.4.3.248  10.4.7.163  RTP 374 Unknown RTP version 0

Real-Time Transport Protocol
        00.. .... = Version: Old VAT Version (0)
Data (332 bytes)
        Data: 01080c0200161851c159e46a3dd0939b5ee2a0382fc05869...
        [Length: 332]

Any help would be welcome.