17 Apr
2011
17 Apr
'11
11:24 p.m.
2011/4/17 Juha Heinanen jh@tutpro.com:
Iñaki Baz Castillo writes:
I've never seen a PSTN gw properly handling a REFER, neither I think a PSTN gw should handle it (but a B2BUA/PBX) between the UA and the PSTN gw(s).
inaki,
your suggestion would mean that proxy would need to route every call between sip ua and pstn gw via a b2bua, because you cannot know in advance, if refer will be used or not.
Yes. But IMHO this is typicall in any PBX environment in which users have short extensions (200, 201...) and the PSTN gws are not aware of them.
--
Iñaki Baz Castillo
ibc@aliax.net