IP Office Basic Edition - M7310: Call Handling > Making Calls
Setting a Callback
If the call is to another internal user, and they do not answer, you can set a callback. When a callback is set, when the other user next uses their phone or ends their current call, the system will call you and when you answer, automatically makes another call to the user.
1.While the call is still ringing or if you hear busy, press the AutCB soft key.