Java Voip developer to create a new GSM termination management software for a new hardware

We need a Java developer that has enough experience in voip & gsm termination, as we need to create a new software for GSM termination management for a new hardware company.
The developer need expertise in VoIP, Asterisk, Asterisk Modules, GSM Modules, GSM Channels, GSM Gateways, Remote SIM Access Profile, rSAP over TCP, SIM Banks, SIM Servers, Softswitch...

The software will be designed for MAC users, pls make sure to own a MAC before bidding