The University of Arizona

Frequently Asked Questions - Caller ID

Caller ID sends the 10-digit telephone number from which a call is being made to the called party, allowing them to see the number calling before they answer the call.  The called party will only see the number if they are using a telephone set that is capable of displaying Caller ID and if the called party subscribes to Calling Number Display.

You will need to subscribe to Calling Number Display. If you have an analog phone line, you must both subscribe to the service and either obtain a phone set with Caller ID capability or an attached Caller ID display unit. If you have a Cisco VoIP set or digital (ISDN) set, the display will be activated automatically. 

No.  If you are using an analog telephone set, you will need to provide your own Caller ID display or replace the set with a phone which has Caller ID as a feature.  Most retail stores that sell telephone equipment carry these phones or Caller ID displays.

Yes.  Dial * 67 before placing your telephone call. The called party's telephone set will display 'Private Number' instead of the Caller ID.

Yes, 'per line' Caller ID blocking is available. Requests to block a large number of lines must have the approval of the vice president for your department.

When a call is placed from a blocked telephone line, the called party's telephone set will display 'Private Number' instead of the Caller ID. Please note that calls placed from a blocked line to a line that has 'Anonymous Call Rejection' or 'Privacy Plus' will not go through.

For the most part, yes, but there are exceptions. The telephone switch cannot deliver your 'private' telephone number to a called telephone line under any circumstances, BUT the caller's number is always available as 'Automatic Number Identification' (ANI) for use in the following circumstances:

  • When you dial 911, ANI is delivered to the Public Service Answering Point and to an Automatic Location Identification (ALI) system. ANI/ALI is used to dispatch emergency service providers to your location.
  • When you dial a toll free number, ANI is delivered to the business or person you call, because they are paying for the call.
  • When you call long distance, ANI is delivered to the long distance billing system.
  • When you dial an operator (0 or 00), ANI is delivered to the operator.

If you experience a threatening or abusive call, dial *57 immediately after you hang up. This creates a report of the call in the University telephone switch system. Then dial 9-1-1 immediately and report the call. The UA Police Department will give you a police report number. Please note that the information on the calling number will not be provided to you. This information will only be provided to the appropriate authorities.