Well, may be he Opensips endpoint? And generate ISUP messages messages? 13.10.2014 11:12, Bogdan-Andrei Iancu пишет: > SIP-I and SIP-T are extensions of SIP - and they are transparent for a > SIP proxy. So OpenSIPS can route SIP-I and SIP-T. What is important is > to have end-points which do understand these extensions.