New subject: Kamailio propagates 180 and 200 OK OUT OF ORDER

9 Apr 2020

On Thu, Apr 09, 2020 at 02:26:45PM +0100, David Villasmil wrote:

...
  How about just not forwarding the 180 if it’s coming
right after the
 200ok?  I know it’s a hack, but a 180 is a provisional response
 indicating the ring status, not the actual audio for the ring... so if
 a 200 is received, the call is already established, no need to forward
 the 180. 
There is a general principle, particularly in PSTN interworking, that
signalling should be reliably conserved end-to-end. I think dropping
messages is the most cavalier option available, perhaps worth
considering only if every other logical possibility has been exhausted
first.

-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Re: [SR-Users] Kamailio propagates 180 and 200 OK OUT OF ORDER