Natural SEO and SEM
Vertical Service Codes
Vertical Service Codes. A special code in North American telephony that is dialed prior to a telephone number that engages some type of special telephone service. Typically preceded by a star key (asterisk *) or followed by a pound key (#). Often referred to as "Star Codes", they are generally two digits, but new codes are 3-digit due to growth. Developed by AT&T in the 1960s, these services must be accessed vertically (through the local telephone company) rather than through any outside service.
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Vertical Service Codes
*00 Inward Voice Activated Services (English)
*01 Inward Voice Activated Services (French)
*02 Deactivation/Activation of In-Session Activation (ISA) (*66) on a per line basis.
*03 Deactivation of In-Session Activation (ISA) (*66) on a per call basis
*12 Call Assistance (Police)
*2X Reserved for expansion to 3-digit VSCs
*30 Cancel Forwarding
*31 Automatic Forwarding
*32 Notify
*3X Reserved for expansion to 3-digit VSCs
*40 Change forward-to number for customer programmable call forwarding busy-line
*41 Six-Way Conference Calling Activation
*42 Change Forward-To Number for Customer Programable Call Forwarding Don't Answer
*43 Drop last member of Six-Way Conference Call
*44 Voice Activated Dialing
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