Patent ID: 6233450
Filing Date: 2001-05-15
Classification: H04M

Abstract:
An autonomous system, wherein said autonomous system is coupled to a public switched telephone network (PSTN) having a public cellular system, and said autonomous system is capable of operation with a mobile terminal operable in both said autonomous system and in said public cellular system, said autonomous system comprising:a receiver for receiving a call comprising a first call signal from the mobile terminal, said first call signal including a called number, said called number including an extra network dialing code and an extension portion;a controller coupled to said receiver, said controller for receiving said first call signal from said receiver and generating a second call signal, wherein said controller compares said extension portion of said called number with a plurality of extension numbers of said autonomous system to determine whether or not said extension portion is within said plurality of extension numbers and, if said extension portion is not within said plurality of extension numbers generates said second call signal including said extra network dialing code and said extension portion, or, if said extension portion is within said plurality of extension numbers, generates said second call signal including said extension portion without including said extra network dialing code; andan exchange coupled to said controller, said exchange for receiving said second call signal and, if said second call signal includes said extra network dialing code, routing said call externally from said autonomous system to a destination determined by said extra network dialing code and said extension portion, or, if said second call signal does not include said extra network dialing code, said exchange further for routing said call internally within said autonomous system to a destination determined by said extension portion.