From: Roman Rodichev (rodic000@xxxxxxxxxxx)
Date: Sun Jun 03 2001 - 04:05:41 GMT-3
This question was bothering me for a long time. RTP header compression
reduces IP/UDP/RTP header size from 40 bytes to 2-4 bytes. I suppose that
happens only each hop (between two adjacent routers). I still don't
understand how receiving router will recognize what's in the packet? Does
anyone know approximate header structure of the header-compressed RTP
packet?
IP header is 20 bytes.
1-Version,1-TOS,2-Length,2-ID,2-Fragm,1-TTL,1-Type,2-Checksum,4-Source,4-Dest.
If the header gets compressed down to 2 bytes (including UDP and RTP), how
will receiving router identify that it is an IP packet, that it has protocol
number 17 (UDP) and what the source/destination is?
Is there a different Ethertype or something? I don't get it
Roman
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