How can I use the Call Back feature
From VoiceMailTel Wiki
To use the Call Back feature from any phone that is not connected to the VoiceMailTel service:
- dial your company's main phone number -> wait for the main greeting to begin -> press * -> wait for the menu to begin -> press 3 -> enter your extension -> enter your extension's password -> the call will be disconnected and the system will call you back
- after you answer the call, a tone is provided in order to enter the phone number to be called
Note: The Call back feature will work only if your phone sends a valid Caller ID.