| 摘要 |
A call-forwarding destination judging unit included in an SIP proxy estimates whether call forwarding will be required, based on the type of an SIP message. When it has been estimated that call forwarding will be required, the call-forwarding destination judging unit also estimates the destination of the call forwarding. With this arrangement, when the delivery of the SIP message requires call forwarding, it is possible to establish, in advance, a TLS connection with the SIP terminal being the destination of the call forwarding. Thus, it is possible to eliminate the need to establish the TLS connection at the time when the call is actually forwarded.
|
