CCSP CSPFA Exam Cram 2 (Exam Cram 642-521)

The Real Time Streaming Protocol (RTSP) is a real-time audio and video protocol used by several multimedia applications, such as RealPlayer, Cisco IP/TV, Quicktime 4, Netshow, and VDO live, to name a few. Similar to FTP, this protocol can operate in different modes depending on the application used. Each mode uses three different connections to function properly.

Real-Time Protocol (RTP) mode uses the following three connections:

  • TCP control channel

  • UDP RTP data channel

  • UDP RTCP reports

RealNetworks' Real Data Transport (RDT) mode uses the following three connections:

  • TCP control channel

  • UDP data channel

  • UDP resend

By default, no fixup protocols are set for RTSP applications; they must be manually set if such applications are needed. The default port used by RTSP is port 554. The following command enables fixups for RTSP:

pixfirewall(config)# fixup protocol rtsp 554

RTSP is not supported using PAT. Most RTSP applications are also incompatible with NAT.

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