An Improved Mobile VoIP Call Setup with Pre-detection of Callee MS State Information

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Provided by: Science & Engineering Research Support soCiety (SERSC)
Topic: Security
Format: PDF
In conventional VoIP services, a call session control server, like the Proxy Call Session Control Function (P-CSCF) in 3GPP IMS, is not aware of the callee's Mobile Station (MS) state information such as idle, active, or loss of connection. This may cause an inefficient or unintentional call setup, and sometimes call setup failure. For examples, although a callee MS is in idle state or loss of connection for some reasons, the P-CSCF would send a call session setup request message to the callee irrespective of the MS state and just wait for a response message for a preconfigured time without any action.
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