Packet forwarding is not supported

[Philipel-WebRTC]

In the use case where a client acts as a node in a network (receiving + forwarding) it is important to preserve sequence number gaps in case of loss. Currently the sender has no way of controlling the outgoing RTP sequence number.

[aboba]

Are there other capabilities needed for selective forwarding, such as SSRC re-writing?

[Philipel-WebRTC]

The assumptions is that a client can create RTP packets, but if we want to reuse a packet for forwarding (avoid copying it) then having mutable fields is probably necessary.