Importance

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Abstract

A multiple subscriber implementing method in a key phone system having an integrated service digital network trunk card connected to a digital telephone line, a public switched telephone network trunk card connected to an analog telephone line and an internal memory containing a plurality of logic ports and registered numbers each indicating a corresponding called subscriber terminal, including a call reception routine of connecting an incoming call containing a called subscriber number to a specific port of a corresponding called subscriber terminal when the incoming call is received through the digital telephone line and the called subscriber number corresponds to one of the registered numbers contained in the internal memory; and a call transmission routine of registering a called subscriber number and transmitting an outgoing call when the digital telephone line is seized by a private line subscriber.

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First Claim