VoIP & PBX Wave-Integrated Application

I'm looking for an expert who has significant experience in creating VoIP and PBX application based on Wave.

Ideal skills:
- Experience with VoIP & PBX applications
- Ability to implement call routing, IVR, call forwarding, IP phone systems, file sharing and instant messaging features
- Audio video communication

Please bid if you are having ready solution and can show demo with access so that we can check and tell you our modifications.

We have many projects so looking for expert.

Thank you!