| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique notifying a call transmission source of the state of a radio telephone terminal in more details when the call arrives at the radio telephone terminal while it cannot answer the call.SOLUTION: If the radio IP telephone terminal 4 is in the state where it cannot answer a call when the call arrives at the radio IP telephone terminal 4, a main device 1 automatically answers the incoming call and transmits a talkie for indicating the presence of the radio IP telephone terminal 4. In this case, when the presence information of the radio IP telephone terminal 4 is registered and if the preference included in the presence information has "high priority", a talkie corresponding to the presence information is transmitted, and if not and when the radio IP telephone terminal 4 is in a zone, a talkie corresponding to the presence information is transmitted, and when the radio IP telephone terminal 4 is out of the zone, an out-of-zone talkie is transmitted. On the contrary, if the presence information of the radio IP telephone terminal 4 is not registered, the out-of-zone talkie is transmitted when the telephone terminal 4 is out of the zone. |
