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Telecom Access Feature Codes

NIH Telephone System Access Codes

These are the most popular access codes allowing you to use the dial-pad on your telephone to access special features. For details on how to activate and deactivate these features, see the NIH TELEPHONE USER GUIDE(Microsoft Word, 219kb)  

Please Note: Not all features listed here are available on all phone lines. If your attempt to access a feature is unsuccessful, you may need to contact the IT Service Desk (ITServiceDesk@nih.gov) to to have the feature activated on your line.

Learn More About Activating and De-activating Features (Microsoft Word, 218kb)

Access Code How the Code Works
* 50 Manual exclusion activate and deactivate – Use this feature code when a line is shared by more than one staff member and privacy is desired on the conversation.
* 52



 *58    
ISDN Change Call Forward Variable Destination – Use this feature when you’d like to answer your calls from another NIH phone (e.g., you are temporarily using a different NIH office and you do not want to miss any calls).

Selective Call Rejection - This feature allows the customer to selectively reject calls arriving from a limited set of predefined telephone numbers.
* 66 Repeat call – Use this feature if you encounter a busy signal when trying to make a call. The feature will monitor the busy line for 30 minutes, and if the line becomes free, will notify you with a special ring.
* 86 Cancel Repeat Call – Use this feature if you have activated Repeat Call and you no longer wish to contact the busy number. Note: If 30 minutes has already passed, then deactivation is automatic.
* 69 Return Call (last number redial) – Use this feature when you’d like to call the last person who called you. If the number is busy the feature will monitor the busy line for 30 minutes and if the line becomes free, will notify you with a special ring.
* 89 Cancel Return Call (last number redial) – Use this feature if you have activated Return Call and you no longer wish to contact the last person who called you. Note: If 30 minutes has already passed, then deactivation is automatic.
* 72 Call forward variable activation – Use this feature code to forward calls to an alternate designation within the NIH.
* 73 Call forward variable deactivation – Use this to cancel call forwarding and return calls to their original destination.
* 74 One digit speed calling – Program your most frequently dialed telephone numbers, (up to 24 digits) into the phone and use 1 digit (2 through 7) to dial the number when you are ready.
* 75 Two digit speed calling – Program your most frequently dialed telephone numbers, (up to 24 digits) into the phone and use 2 digits (20 through 49) to dial the number when you are ready.
* 85 6-Way Conference (ISDN telephone)
* 106 6-Way Conference (Analog telephone)

For additional information, please contact the NIH IT Service Desk:

Phone: 301-496-4357
TDD/TTY: 1-800-438-8832
E-mail: ITServiceDesk@nih.gov
Web: ITServiceDesk.nih.gov

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This page last reviewed: November 09, 2011