Realtime Transport Protocol. RTP in general is described in RFC 3550. This range is not registered (it never could be, being so broad) but it seems to be somewhat common. See Are there specific ports assigned to RTP?
RTP: UDP ports 16384-32767
Source: TCP/IP Port Table
Seel Also:
RTP FAQ
September 17, 2011 May 4, 2009 September 27, 2004 June 5, 2007 May 15, 2004 September 27, 2004 February 2, 2005 August 8, 2005 February 15, 2009 July 8, 2004
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