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The RTP payload format for retransmitted RTP packets and packet-pair data, as specified in section 2.2.3, MUST be identified by the MIME type "application/x-wms-rtx".
The RTP clock frequency MUST be 1,000 Hz.
There are no format-specific parameters for this RTP payload format; therefore, the "a=fmtp" field SHOULD NOT be specified.
The "a=reliable" field MUST NOT be specified.
When this RTP payload format is used, it MUST be specified as a separate media description; that is, it MUST NOT share a media description with other ASF streams. That is because retransmitted RTP packets SHOULD be transmitted on an RTP session separate from the one used by the original RTP packets. For details, see section 2.2.3.<3>
For example:
-
m=application 0 RTP/AVP 97 a=rtpmap:97 x-wms-rtx/1000 a=control:rtx