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New Code Overlay Will Affect Northern California Alarm Companies

Posted By Administration, Tuesday, August 19, 2014

A new code overlay will affect alarm companies in northern California. To ensure a continuing supply of telephone numbers, the 628 area code will be added to the area served by 415.  The new 628 area code will serve customers in the same geographic region as the current 415 area code.  This is known as an area code overlay.


What is an area code overlay?

An overlay is the addition of another area code (in this case 628) to the same geographic region as an existing area code (415).  An overlay does not require customers to change their existing area code.


How does this affect providers of alarm and security services and equipment?

As a result of the overlay, a new dialing procedure requires callers to dial 1 + area code + 7-digit telephone number. This means that all calls in the 415 area code that are currently dialed with seven digits will need to be dialed using 1 + area code + 7-digit telephone number. 


Alarm and security services and equipment currently located in the 415 area code and programmed to dial only seven digits must be updated or reprogrammed to dial 1+ area code + 7-digit telephone number for all calls in the 415/628 area code.


When will the change take place?

  • Beginning August 16, 2014, customers should begin using the new dialing procedure (1 + area code + 7-digit telephone number) when placing calls from the 415 area code.  If customers forget and use the old dialing procedure of dialing just seven digits, calls will still be completed.
  • Beginning February 21, 2015, customers must use the new dialing procedure for all calls.  After this date, if customers do not use the new dialing procedure, calls will not be completed, and a recording will instruct them to hang up and dial again.
  • Reprogramming of alarm equipment should take place between August 16, 2014 and February 21, 2015. This period allows either the old or new dialing procedure to be used to complete calls.  All alarm service providers must make their programming changes during this period.
  • To enable you to verify that equipment can complete calls to the new area code, a special test number will become available on December 21, 2014.  This special number, (628) 628-1628 will remain active through April 21, 2015.
  • Beginning March 21, 2015, new telephone lines or services may be assigned numbers with the new 628 area code, and it will be necessary to dial 1 + area code + 7-digit telephone number for all calls within the 415 and 628 area codes.


What will remain the same?

The price of a call, coverage area, or other rates and services will not change due to the overlay, and what is a local call now will remain a local call regardless of the number of digits dialed. Customers can still dial just three digits to reach 911, as well as 211, 311, 411, 511, 611, 711 and 811.


Questions about the dialing procedure change should be directed to your local service provider, or you can call the California Utilities Commission, Consumer Affairs at 1-800-649-7570 or visit the California Utilities Commission website at for more information.


Tags:  Alarm  CAA  California  Code Overlay 

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