| 摘要 |
A switching service control unit of a switchboard, when a first terminal performing a multi-call communication based on a plurality of media with a second terminal makes a request of transferring the communication call to a third terminal, discriminates a media attribute used for the multi-call communication conducted by the first terminal with reference to connection data held by a memory. The switching service control unit discriminates whether or not the third terminal is capable of controlling this media characteristic with reference to the terminal attribute held by the memory. The switching service control unit, when discriminating that the third terminal is capable of controlling that media attribute, transfers the multi-call communication conducted by the first terminal to the third terminal./!
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