Martin Koenig writes:
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.
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.
-- juha