| 摘要 |
A core network connected to a mobile communication network and establishing voice communication between communication apparatuses receives, from the mobile communication network, to which an originating mobile communication apparatus is connected, a connection request that includes an identifier identifying a terminating communication apparatus, and determines at least one codec that can be used in a terminating network to which the terminating communication apparatus is connected. When the at least one codec that can be used in the terminating network can be used in the core network, the core network signals, to the originating mobile communication apparatus, that codec as a codec candidate that should be used by the originating mobile communication apparatus.
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