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Reply To: I need a SIP guru to mentor me.

Andrew Zhilenko

There are several possible solutions. First of all you can try to build you own SIP solution from free components such as ser, asterisk, vovida, … Will take you some time, and requires skilled professionals with SIP experience – otherwise you will just waste time&money.
Or you can get a complete commercial SIP solution (perhaps integrated with the billing). You can check Cisco SIP server – it is about 40K and is not billing integrated, or PortaSIP from Porta Software ( – definitely cheaper and can be used standalone or together with PortaBilling.