| 摘要 |
A core network connected to a mobile communication network and a network and establishing voice communication between communication apparatuses receives a termination notification response indicating at least one codec that can be used by a terminating mobile communication apparatus from the mobile communication apparatus. The core network specifies either a common codec that belongs to the intersection of the at least one codec that can be used by the terminating mobile communication apparatus, indicated in the termination notification response, and an originating codec, or a codec that can be used by the terminating mobile communication apparatus and the core network and that has a transmission rate closest to the transmission rate of the originating codec, as a codec that should be used by the terminating mobile communication apparatus.
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