Hi, I have to implement a rather uncommon SIP setup and wanted to ask, if it is even possible with Kamailio. We are among other things a VoIP-provider for a couple of hundred customers. Right now we use a rather old piece of software as a SIP-server, that was written in-house and is deeply integrated in our user interfaces and the billing system and can't be replaced easily. But now we need to make some modifications because our PSTN-gateway-provider is changing things. The idea is to use Kamailio as proxy in front of our old SIP-server. But to do this we need to pass through the REGISTER requests of our users to the old SIP-server. So the question is if Kamailio supports this kind of passthrough and I would also be rely grateful for a piece of example config, if somebody already has a similar setup running. So far neither the documentation nor google have been very helpful. Best regards Kai -- Kai Arif - System Administrator Inter.net Germany GmbH Knesebeckstraße 59-61 10719 Berlin Germany Fon +49 30 25430 0 Fax +49 30 25430 499 arif(a)team.de.inter.net www.de.inter.net Legal-Information: Inter.net Germany GmbH, HRB #79136, Amtsgericht Berlin Charlottenburg, UST-IdNr:: DE 813 165 159 FA für Körperschaften I Berlin, Geschäftsführer: Jörn Lubkoll, Christian Röhl Zuständige Regulierungsbehörde: Bundesnetzagentur Chemnitz, Liselotte-Herrmann-Str. 20a, 09127 Chemnitz, Registriernummer: 06/164