Use inband signaling for information, such as the address digits for the called party, that is delivered over the same trunk circuit that is used for the voice or data connection. Use out-of-band or ISDN signaling when signaling information passes through a different signaling path than the path that is used for the voice or data connection.

For example, when a call is made from 555-3800 to your display telephone at extension 81120, and the Incoming Tone (DTMF) ANI field is set to *ANI*DNIS* on the Trunk Group screen, your trunk group receives *5553800*81120*. If the same field is set to ANI*DNIS*, your trunk group receives 5553800*81120*. In both cases, your telephone displays call from 555-3800.

Your telephone displays the incoming trunk group name if you do not use inband ANI.