| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable prevention of repeated calls from a nuisance caller by the will of a nuisance call recipient in an IP telephone system using SIP. <P>SOLUTION: When UA/1 transmits a call session establishment request (Invite), a SIP server transmits the Invite with the addition of an identifier showing blacklist information based on the information acquired from a blacklist database to UA/2 corresponding to a utilization terminal of a recipient. UA/2 also transmits a call session end request (Bye) with the addition of a cutoff request to the SIP server, when the recipient inputs the cutoff request. Receiving the Bye with the addition of the cutoff request, the SIP server transmits the Bye to UA/1 as well as activates a cutoff timer to transmit a response for inhibiting the Invite of UA/1 until the timer is expired. <P>COPYRIGHT: (C)2012,JPO&INPIT |
