| 摘要 |
The method establishes connections from and to a secondary client (SIP-client) of a packet-switched network (SIP network) to and from a circuit-switched wireless telephony network. The secondary client (SIP-client) of the packet-switched network is identified by the same MSISDN number as a first, mobile client being subscribed to the circuit-switched wireless telephony network. In case of the secondary client calling, a IN (Intelligent Net) service (SIP-S) is used which provides the GSM services normally being executed by a VMSC (Visited MSC) for a roaming mobile phone. In case of a MSISDN number shared between a first, mobile client and a secondary SIP-client being called, after execution of all terminating GSM services, an IN (Intelligent Network) Service (SIP-S) is used to let both clients ring in parallel, and establish connection to that client which answers first.
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