Hello, I installed Freeswitch 1.5.7 and am trying to configure it as an telephony application server in an IMS network. Here is the high-level signaling flow that I am considering. 1. Two SIP users (User-A and User-B) registered with S-CSCF in the IMS network (not with Freeswitch) 2. User-A makes a voice call to User-B. 3. S-CSCF forwards the SIP INVITE to Freeswitch. 4. Freeswitch acting as a B2BUA changes SDP to anchor the media flow and sends SIP INVITE to User-B back to S-CSCF. 5. SIP 200 OK from User-B follows the same path as INVITE in reverse direction. I went through the dial-plan documentation and could not figure out whether such a configuration is possible. Please let me know whether such a configuration is feasible and any broad pointers on how to make it work would be appreciated. Thanks, Thomas