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.
Agreed. Just suggesting an extreme.
On Thu, 9 Apr 2020 at 14:51, Alex Balashov abalashov@evaristesys.com wrote:
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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