3CX IP PBX Windows Phone System

==Features==

 

The flexible and easy-to-use system for school bells, factory bells, paging, intercom, and emergency notification.

 

This is software.

 

==Interoperability==

 

Cyberdata said this works with any SIP compliant IP PBX.

I haven't tested it.

 

==Link==

 

 

Pricing: