System and method for switching ringing state session with customized alerting tone

A method for session handing over in alerting phase when having a customized alerting tone comprising:

• a Service Centralization and Continuity Application Server (SCC AS) receiving a handover request;
• when the said SCC AS determining a session to be handed over is in alerting phase and only a customized alerting tone session exists in that session, then said SCC AS initiating a handover to the customized alerting tone session;
• and
• after the said SCC AS receiving an off-hook response from the called user, the said SCC AS determining whether that a normal media negotiation session included therein is correlated with the previous customized alerting tone session;
• if yes, then said SCC AS completing a handover to the normal media negotiation session.

A system for session handing over in alerting phase when having a customized alerting tone, comprising a Service Centralization and Continuity Application Server (SCC AS);

• wherein,
• the said SCC AS is configured to:
• after receiving a handover request, when it determines a session to be handed over is in alerting phase and concurrent negotiation for a normal media session and a customized alerting tone session exists, then said SCC AS setting up the correlation between the handover request, the customized alerting tone session, and the normal media negotiation session;
• and
• the said SCC AS assisting to complete a handover to the normal media negotiation session and a handover to the customized alerting tone session.

A system for session handing over in alerting phase when having a customized alerting tone, comprising a Service Centralization and Continuity Application Server (SCC AS);

• wherein,
• the said SCC AS is configured to:
• after receiving a handover request, when it determines a session to be handed over is in alerting phase session and only a customized alerting tone session exists in that session, then said SCC AC initiate a handover to the customized alerting tone session;
• and
• after the said SCC AS receiving an off-hook response from the called user, the said SCC AS determining whether that a normal media negotiation session included therein is correlated with the previous customized alerting tone session;
• if yes, then said SCC AS completing a handover to the normal media negotiation session.