TIN 25-02 Update
Telecommunications Information Notice 25-02 Update: New 457 Area Code and Change to Local Dialing for the 318 Area Code Region
August 25, 2025
To ensure new telephone numbers are available, the Louisiana Public Service Commission approved the addition of the new 457 area code to the geographic region served by the existing 318 area code. This process is known as an area code overlay. An overlay does not require customers to change their existing area code but does require using a new 10-digit dialing procedure to complete local calls.
Beginning February 24, 2025, 10-digit dialing replaced 7-digit dialing for local calls in the 318 area codes. There was a transition period before the 10-digit dialing became mandatory. Beginning August 25, 2025, local calls dialed with only 7 digits may not be completed. Calls may reach a recording indicating the call cannot be completed as dialed, and the caller may be instructed to hang up and dial again including the area code. Beginning September 25, 2025, new telephone lines or services may be assigned numbers with the new 457 area code. Outgoing calls from a number with the new 457 area code must include 10 digits to complete.
Note the following services will remain unchanged:
- Centrex-to-Centrex abbreviated dialing (five-digit dialing)
- HVS-to-HVS dialing (seven or ten-digit)
Systems and services which are programmed to complete calls to local numbers may be affected by this change. Agencies are reminded to review and update items including but not limited to:
- Speed dial keys
- Call forward settings
- Voice mail services
- Wireless telephone contact lists
- Autodialers
- Fax machines
- Alarm systems
- Monitoring systems
- Key systems
- PBXs
- Other systems or services
Agencies with on-site communications systems may gave heard from the system administrator/vendor regarding updates. If an agency with a key system (Executone, Avaya, etc.) or PBX (Avaya, Carousel, etc.) has not been contacted, the Office of Technology Services recommends the agency contact the system administrator/vendor.
Questions regarding this notice should be directed to NCSSystemsProjectsManagement@la.gov.
