Single Number Indication for Parallel Ringing

The feature Single Number Indication is activated when parallel ringing is initiated. It ensures that the B-extension will always see the same directory number independently from which telephone the A-extension makes a call.

Note: Single Number Indication has some limitations in certain private network services, since only one number can be conveyed in the network. For example, the features Diversion, Callback, and Call Information Logging will use the directory number, not the additional directory number.