You recall inside the setup required signal of recall call from the urgent call admission base manner of the urgent call recall

摘要

PROBLEM TO BE SOLVED: To certainly receive a calling-back call brought from an urgent-call receiving stand stored in a public telephone network at an urgent-call sender terminal, without holding a connection session to the urgent call in a VoIP network.;SOLUTION: A terminal of a VoIP gateway apparatus storage sends the urgent call. After a call from the terminal side is cut, the VoIP gateway apparatus controls a sending from the terminal for a prescribed term. With regard to a receiving call to the terminal during the sending control term, the VoIP gateway apparatus conducts identification of the urgent-call call back by information, to show that it is an added urgent-call call back. When the receiving call is a urgent-call call back, it is received by a receiving method, set in advance, for each contract service of the sender.;COPYRIGHT: (C)2007,JPO&INPIT