[Serusers] Need Help!!!

Hi, I want to make an application server using SER with few more entities. The system would be like this | XLite Phone | -------------------- | SIP Proxy Server | --------------------- | App Server using SER | -------------------------- | Media Server | Now these are the tasks I need to accomplish: 1. Registering App Server with SIP Proxy Server. (How to register SER with another Proxy Server?) 2. It should also behave like a proxy. (SER should forward the packet to and from Media Server) 3. RTP must only be created b/w XLite Phone and Media Server. 4. And finally sending INFO Method from App Server to Media Server with MSCML Script. (How does SER send INFO Method with an xml script as a body?) Please suggest something how should I achieve it. Thanks and Regards, Kapil Goel