| 摘要 |
PROBLEM TO BE SOLVED: To provide an intercom system for preventing a call/speech function with respect to an intercom master unit from being restricted even when an IP telephone set to be operated with a SIP is connected to the intercom system in the same SIP specification.SOLUTION: An IP telephone set is connected via a communication network. A slave unit CPU 16 receives a call operation, generates a call signal based on a SIP, and transmits the signal to a master set 2 or an IP telephone set 3. The call signal to the master set 2 is transmitted after the addition of specific information including at least call priority information. A master set CPU 25 reads the specific information added to the call signal and performs a predetermined operation. |
