Patent ID: 6088438
Filing Date: 2000-07-11
Classification: H04M,H04Q

Abstract:
A method for connecting mutually a first exchange system and a second exchange system, comprising the steps of:analyzing a called telephone number through the first exchange system to determine in which exchange system said called telephone number exists and determining whether a call corresponding to the called telephone number is a network call when dialing the call at an extension of the first exchange system when the first exchange system is connected to the second exchange system;if it is determined that the call is a network call, then:determining if an X channel connected between the first exchange system and the second exchange system is in an active state for the call;connecting the call if said X channel is in the active state for the call and sending the call to the second exchange system by calling said X channel;if said X channel is not in the active state for the call, connecting the call so as to set up a channel as said X channel and also sending the call as an original call to the second exchange system; andsending and receiving information between the first exchange system and the second exchange system through said X channel.