[Kamailio-Users] Call Stateful Server

Hi list, I need some explanation about using Kamailio as a Call Stateful Proxy. I understand that Kamailio is a transaction stateful proxy. And I would like to learn how I can achieve a Call Stateful Proxy using Kamailio. I'm going to use Asterisk for transcoding to receive and send calls to the users and Kamailio should do the routing process using carrierroute, deciding to which carrier the calls should be sent to. Customer Carrier1 Group1 \ / \ / \ / Customer ---->GW ---> Kamailio ---> GW ---> Carrier2 Group2 Asterisk Asterisk / \ / \ Customer / Carrier3 Group3 Now it works with x-lite, if customer1 calls to certain number the call is send to the correspondent carrier base on the prefix number. But when I add the GWs, how I can send the call to the GW IP address (Asterisk) and then forward to the IP address of the carrier that I assigned for that prefix number in my carrierroute table. Can any of you could help me to clarify this or guide me about what to read, so I could implement this. Thanks in advance, Juan.-