Verifying and identifying incoming PBX calls on mobile devices via DTMF

摘要

Aspects relate to provision of enterprise call capabilities to mobile devices. For example, a mobile device can indicate, over a data channel, that a PBX is to make a call on its behalf to a called party. The PBX can call back the mobile device, call the called party, and bridge those call legs to establish the call. The mobile device can employ mechanisms to certfiy that a particular incoming call is made by PBX. These mechanisms can include using ANI information, sending and receiving audible verification codes (DTMF) over the voice channel established after answering the incoming call. The verification codes can be selected based on different behaviors of the mobile devices and the network or networks used by the device(s).