ISDN Call Identification Display overview

Last Updated : Oct 30, 2012 |

Two types of identification numbers are provided with ISDN and may be used in the various types of displays used with ISDN. The two types of identification numbers are as follows:

  • Calling Party Number (CPN): A 0-15 digit DDD number associated with a specific station. When a system user makes a call that uses ISDN, that user’s CPN is provided by the system for ISDN. ISDN public-unknown numbering or ISDN private numbering screens are administered to create a 0-15 digit CPN from a local station number.

  • Billing Number (BN): The calling party’s billing number, which is provided to an inter-exchange network by way of Equal Access or CAMA. This number is stored at either a local or network switch. If a customer is connected directly to the AT&T Switched Network, the BN is the customer’s billing number stored in that network. If the CPN is not provided on an incoming ISDN call, the network uses the BN for the station identification number.

The following types of display information are provided with ISDN:

  • Calling party’s number

    The called party's screen displays the calling party’s number. This number is provided only if the outgoing ISDN trunk group is administered to send the CPN, and if ISDN public-unknown numbering or ISDN private numbering screens are administered to create a CPN. On calls incoming to a system, the network may provide either the CPN or BN as the calling party’s number. Extensions and 12-digit international numbers display without dashes. Dashes are only used for 7-digit and 10-digit numbers when North American Area Code is enabled on the Dial Plan screen.

  • Calling party’s name

    The called party's screen displays the calling party’s name. On calls generated from a DEFINITY server, the caller’s name is provided if the ISDN trunk group is administered to send the name to the network. On calls incoming to a DEFINITY server, the (public or private) network may provide the caller’s name. If the caller’s name is unavailable, the called party’s display shows CALL FROM instead, followed by the calling party’s number (if available).

  • Connected party’s number

    The caller's screen displays the connected party’s number. On calls generated from a DEFINITY server, callers’ displays may show the digits dialed as the call is made. If the (public or private) ISDN network provides the connected party’s number, the calling party’s display is updated to show the connected party’s number. The format of the connected party’s number is the same as that of the calling party’s number described previously on calls incoming to a DEFINITY server. The 0-15 digit number of the party who answers the call is provided to the ISDN network only if the incoming ISDN trunk group is administered to send connected number to the network and ISDN public-unknown numbering or ISDN private numbering screens are administered to create a CPN.

    Note:

    The connected party may be the party actually called, in the event the call is transferred before the connected party answers the call.

  • Connected party’s name

    The caller's screen displays the connected party’s name. On calls generated from a DEFINITY server, the (public or private) ISDN network may provide the connected party’s name to the Communication Manager, when the call is answered. If the connected party’s name is unavailable, the calling party’s display shows ANSWERED BY, followed by the connected party’s number (if available).

    On calls incoming to a DEFINITY server, the connected party’s name is provided if the incoming ISDN trunk group is administered to send the name to the network.

Depending on how the media servers or switches that are involved in a call are configured, parties may see none, some, or all the information described above.