Hello Mahan, My suggestion would be to do a lot more research: i) http://www.opensips.org/Documentation/Tutorials-OpenSIPSAsteriskIntegration ii) http://www.voip-sip.org/wp-content/uploads/2011/08/Building-Telephony-Systems-with-OpenSIPS-1.6.pdf
Take a few weeks and get to know opensips and build up your config to do what you require from it as a proxy. Without more work on your part, I really can't offer any help myself. Maybe others on here can. If this is too hard a task for you. you can possibly seek an individual/company that can offer consulting work for your company. Terrance
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