| 摘要 |
System for providing seamless telephony service to a user with multiple devices such that it appears to callers that the user only has a single device. An infrared interface (13) is provided such that the status of each device is known to the others.
In particular this private branch exchange (1) includes a first communication portion using infrared links (13) acquiring connection target specifying information (224a) related to a connection target (4) from a portable terminal (2a,2b,2c,2d), a second communication portion using analog or IP links (11,12) allowing telephone communication between a fixed telephone (3a,3b,3c,3d) associated with the portable terminal i.e. used by the same person and the connection target, and a control portion (16) making a call to the connection target on the basis of the connection target specifying information and ringing the fixed telephone associated with the portable terminal from which the connection target specifying information has been acquired |
