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/

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