On 8/31/15 12:41 PM, Franz Edler wrote:
The 180 doesn't mean that you should generate ringback instead of playing
in-band ringback.
You should treat the 180 as meaning: generate ringback if you are not
receiving in-band media.
O.k. understood, but the " ... if you are not receiving in-band media" is
nowhere specified, or is it?
AFAIK it is not in any formal spec. It has been discussed on mailing
list(s) (ietf lists or this one) from time to time.
This is right on the boundary of what the specs do/don't cover. It is
about the UI, not the protocol. You can be conformant to the specs
regardless of what you actually render to the user. So it is actually a
quality of implementation issue. But it is a problem for those who don't
know the implications.
Thanks,
Paul
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
