rostrvm ScreenPhone is a software only voice over IP phone that utilises the hardware in your PC and network to provide an enhanced telephone capability.

The following areas of functionality are described throughout this manual:

Getting Started - includes an overview, how communications are configured and how functions are invoked;
Making and Receiving Calls - includes holding, transferring, monitoring and conferencing calls and the call display options;
Creating a phone book - simplifies the process of making outgoing calls;
Call Treatment - includes call forwarding, voice mail, call recording, and playing back recordings;
Updating the ScreenPhone

 

ScreenPhone will work over the internet where Network Address Translation (NAT) is in use, provided that the NAT routers are not the Symmetric NAT type.  Voice quality when using the internet is not guaranteed.