Caller ID and Related Features

  • This section contains information about the Caller ID service offered through Verizon. IUP’s Centrex service provides all IUP telephone lines covered by this agreement with basic caller ID capabilities. All Caller ID costs are covered by the basic agreement. 

    Caller ID displays the telephone number of the person who is calling. The caller ID information is passed to your telephone by Verizon between the first and second ring. This information will be displayed if your telephone instrument is capable or if you have attached a special unit which displays the number to your telephone. Many phones and auxiliary display units maintain a call history so you can review who has called you. Callers may also choose to have their numbers blocked when making a call.

    Blocking the Display of Your Phone Number:

    When you call someone who has Caller ID, your phone number will appear on their display unit. You may choose to block the display of your phone number by using Per Call Blocking or Line Blocking. There is no charge if you use Per Call Blocking. Verizon will assess a one-time service charge if you request permanent Line Blocking.

    • Per Call Blocking
      • Dial 670.
      • Dial the telephone number of the person you are calling.
    • Line Blocking
      • If you want to have the display of your number blocked on all calls made from your phone, submit an ihelp ticket to request Line Blocking. Verizon may apply a service charge to install this feature on your line.  

    Anonymous Call Rejection:

    If you do not wish to receive calls from people who block the display of their phone numbers, activate the Anonymous Call Rejection feature.

    • To activate ACR: 
      • Dial 120.
    • To deactivate ACR:
      • Dial 123.

     When ACR is activated, your phone will not ring when an anonymous call is received. The caller will receive a recorded message saying that blocked calls are not accepted.