[SR-Users] append_hf to CANCEL

Alex Balashov abalashov at evaristesys.com
Wed Nov 20 15:09:09 CET 2013

On 11/20/2013 09:05 AM, Grant Bagdasarian wrote:

> Does append_hf not work for CANCEL requests?

Correct:  CANCEL is a "hop-by-hop" request where the proxy is a distinct 
hop, i.e. UAC sends a CANCEL to the proxy, and the proxy sends a 
separate CANCEL of its own on the branch that it initiated.  This is in 
contrast to something like a BYE, and most requests, which are 
end-to-end request that the proxy simply relays upstream as received.

-- Alex

Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

More information about the sr-users mailing list