| 摘要 |
A user equipment is provided with connection to a first mobile service network providing circuit-switched services. A first protocol module communicates with the first mobile service network. A circuit-switch tunneling control protocol module establishes a circuit-service tunnel to a second mobile service network providing packet-switched services. A circuit-switch tunneling data protocol module transmits a circuit-service tunneling message from the first protocol module to the second mobile service network via the circuit-service tunnel.
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