Hello,
To really make this and other features ISDN-like features
work in the
network, one needs a b2bua somewhere.
no you don't. ser can quite easily be made to turn the 302 to an another invite, where b is listed as caller in rpid or diversion header.
Could you please elaborate further how to enable this feature?
but as i have said many times already, this would violate the called party's right to tell to the calling party where he can be reached IF the calling party wishes to try that other destination.
That's why i said ISDN-like features. If the final call destination (f.e. a cellphone number) should not be revealed to the caller, then a b2bua is nessecary. Or to put it different: What about the called party's right to deflect calls to any possible destination without further interaction with the caller.
Best regards, Martin