2.2.1.2 RTP Header Usage for ASF Data

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The meaning and syntax of the fixed RTP header are specified in [RFC3550] section 5.1 and by the RTP profile in use with the following additional notes:

Marker (M): This bit MUST be set to 1 if the RTP packet contains the last fragment of an ASF data packet, or one or more complete ASF data packets. Otherwise, it MUST be set to 0.

Payload Type (PT): There is no predefined RTP payload type number for this RTP payload format. Instead, this 7-bit field MUST be assigned to a number as defined by protocol implementer. For example, the payload type can be assigned by using SDP, as specified in section 2.2.5.

Timestamp: This 32-bit field MUST be set to the value of the Send Time field of the first ASF data packet contained in the RTP packet. To find the Send Time field of an ASF data packet, see [ASF] section 5.2.2. The time is expressed in milliseconds, unless otherwise specified; for example, through SDP.