| 摘要 |
A switching server 100 relays VoIP packets transmitted from a cellular phone terminal 300A to an IP phone terminal 42, and sequentially acquires the receiving times of the VoIP packets received from the cellular phone terminal 300A. In addition, the switching server 100 switches a communication route R1 via a radio IP network 10A to a communication route R2 via a radio IP network 10B, on the basis of the multiple receiving times thus acquired.
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