VertiCall

A mobile extension for all VertiCall-compatible phone systems. The app acts like any other extension on your phone system, allowing you to perform common tasks such as transferring calls to another extension or making outbound calls with your work number as the Caller ID.

Unlike many other mobile softphones, VertiCall just works. You shouldn't have to change your network or fill out pages and pages of complicated settings. Simply log in with the username and password provided by your phone system vendor, and away you go!