[asterisk-dev] Reducing RTP overhead

Jeffrey C. Ollie jeff at ocjtech.us
Mon Feb 13 06:35:03 MST 2006

On Mon, 2006-02-13 at 08:23 -0500, Kristian Kielhofner wrote:
> 	Exactly.  Cisco gear seems to use it (and RFC 2509 with PPP) mostly on 
> frame relay PtP connections (with 7200 series routers to boot)!  I was 
> excited about RFC 2508 until I read that to go from 40 bytes to 4 bytes 
> (with UDP checksum, 2 without) you need to compress the IP header AND 
> the UDP header AND the RTP header.  Shoot, that won't work without 
> non-RFC2508 aware IP equipment (i.e. probably just about any router). 
> Yes, please, ECRPT links anyone?

Also, Cisco does not recommend using cRTP on links faster than a T1,
presumably because of the memory usage and/or CPU load.


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