METHOD AND SYSTEM FOR PROVIDING PTT TO CONFERENCE

摘要

A method for servicing a conference call during progression of a PTT(Push To Talk) service and a system therefor are provided to enable conversion into a conference call during the PTT service, without newly initializing a conference call service after an existing PoC(Push to talk over Cellular) session is terminated. A request procedure for conversion into a conference call is performed during progression of a PoC session among UEs(User Equipments)(740,750,760)(702). Conference call client invite/participate procedures are carried out to open a conference call session through a conference call server(700)(704a-704c). Procedures for canceling the conference call session between a PoC server(710) and the UEs(740,750,760) are conducted(705-706c).