| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a backup exchange capable of performing backup for the inside of a base to continue and operate the operation of IP terminals and allowing the IP terminals to conduct extension calls, even if a fault occurs at an IP exchange or a line. <P>SOLUTION: When a failure occurs at an IP exchange (TM) 2 or a line (network) 5, a backup exchange (backup TM) 6 is switched from a standby system to a working system. All of IP terminals Eqi in bases A, B, ..., N also log out from the IP exchange (TM) 2, and transmit IP addresses to the backup exchange (backup TM) 6 in the own base to log in, respectively. Then, according to the control of the backup exchange (backup TM) 6, extension calls in the own base can be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
