NIH Telephone System Access Codes allow you to use the
dial-pad on your telephone to access features such as those listed below.
Not all features listed here are available on all phone lines.
If your attempt to access a feature is unsuccessful, you may need to submit a
TSR form to DNST to have the feature activated on your line.
Click here for a contact list of TIB Specialists. They can assist you with details and explain your options.

Dial Code	Feature
2-7	One digit speed calling
20-49	Two digit speed calling
* 50	Manual exclusion activate
* 51	Manual exclusion deactivate
* 52	ISDN change call forward variable destination
* 53	Extinguish message waiting light
* 57	Customer originated trace
* 58	Selective call rejection
* 60	Teleos IMUX ISDN PRI access code
* 61	Priority call activate
* 62	Call forward variable change destination outside the switch
* 63	Selective call forwarding
* 64	Selective call acceptance (up to 6 numbers can get through)
* 66	Repeat call activate
* 67	Block caller ID
* 68	Directed call park
* 69	Return call activate (last number redial)
* 70	Cancel call waiting
* 71	Directed call pickup without barge in
* 72	Call forward variable activation
* 73	Call forward variable deactivation
* 74	One digit speed call add
* 75	Two digit speed call add
* 76	Call forward busy line - change forwarding number
* 77	Call forward don't answer - change forwarding number
* 78	Call hold
* 79	Group call pickup
* 81	Call forward busy line activate
* 82	Call forward busy line deactivate
* 83	Call forward don't answer activate
* 84	Call forward don't answer deactivate
* 85	ISDN 6-port conference
* 86	Cancel repeat call
* 88	Directed call retrieve
* 89	Cancel last number redial
* 99	Unidentified Call Rejection (Analog Lines Only)
106	Analog 6 port conference bridge
Click here to visit the on-line ISDN User Guide or All NIH Telecom requirements must be processed through the Telecommunications Infrastructure Branch Call:      301-496-4357 (301-496-HELP) E-mail:    helpdesk@nih.gov or Visit NIH Support at:http://support.cit.nih.gov/ E-mail:   Telecommunications Webmaster TDD/TTY: 1-800-438-8832
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