Devices and methods of using Citi-2 trunk lines and general trunk lines in a local exchange

摘要

The present invention relates to a CT-2 (The Second Generation of Cordless Telephone) and more particularly to a CT-2 connected to a CT-2 and a private branch exchange The present invention relates to an apparatus and method for selecting and using a CT-2 trunk line and a common trunk line in a public branch exchange in which a terminal can select and use a trunk line capable of making economical calls from a general trunk line and a CT-2 trunk line.;In the conventional outgoing-only terminal, only a call can be made and a general trunk line can not be used. Since the trunk exchanger is connected to a public telephone network or an ISDN trunk line through a wired line, the CT-2 trunk line using the public telephone network can not be used over the air, Is not efficient, and there are uneconomical problems because there is a difference in the call charge when using CT-2 trunk line or general trunk line in a certain area.;The present invention enables a connection between a private branch exchange and a call-only terminal, so that a terminal connected to a call-only terminal and a private branch exchange selects a call line that can make an economical call from a general line and a CT-2 line, Thereby providing an efficient and economical communication means.