Method of providing video-call service using general voice-call terminal and private branch exchange for performing the method

摘要

In a method of providing video-call service using a general voice-call terminal and a Private Branch Exchange (PBX) for performing the method, the following steps or functions are performed: exchanging, at a PBX, video media information with a video-support adaptor for providing video-call service to a voice-call terminal; and exchanging, at the PBX, moving picture media information to be used by the voice-call terminal and the video-support adaptor with a counterpart video-call terminal so as to establish a session between the video-support adaptor and the counterpart video-call terminal. The PBX includes a call processor and a Session Initiation Protocol (SIP) agent. It is possible to provide video-call service between a conventional terminal not having a video screen and various videophone apparatuses by interworking the conventional terminal with SIP-based video software or hardware.