SIP Proxy

I need a SIP Proxy able to act as server for n.1 SIP account and as client for n.10 SIP account. The software must allows the user to choose which account to answer, put on hold another one. ## Deliverables [login to view URL] requirements notice: As originally posted, this bid request does not have complete details. Should a dispute arise and this project go into arbitration "as is", the contract's vagueness might cause it to be interpreted against you, even though you were acting in good-faith. So for your protection, if you are interested in this project, please work-out and document the requirements onsite. The programmer is free to decide if to use a SIP library like the sofia sip library or to develope own SIP functions. If the programmer decide to develope own SIP function, he can just setup communication via UDP. Anyway I can provide detailed support for SIP protocol and for general development.