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Feature

UDPTL mechanism

RTP mechanism

1

Payload format

UDPTLPacket specified in Annex A

Without redundancy and FEC, RTP payload is a single IFP packet. When FEC packets constitute a separate stream ([IETF RFC 5109]), the RTP payload is a single IFP packet.
With [IETF RFC 2198]-based redundancy, the RTP payload structure is as specified in [IETF RFC 2198]. With FEC that uses [IETF RFC 2198] encapsulation, the RTP payload structure is as specified in [IETF RFC 5109] and [IETF RFC 2198]

2

Payload sequencing

UDPTL sequence number

RTP sequence number

3

Redundancy

Uses mechanism defined in clause 9.1.3.1 UDPTL FEC message format

[IETF RFC 2198]

4

FEC

Uses mechanism defined in Annex C The optional forward error correction scheme for UDPTL

[IETF RFC 5109], with or without [IETF RFC 2198] encapsulation

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