Method and system for controlling session for interworking in converged ip messaging service

A session control method in an Interworking Function (IWF) for supporting a Converged Internet Protocol (IP) Messaging (CPM) session between a first client subscribing to a CPM service and a second client not subscribing to the CPM service, the session control method comprising the steps of:

• after the CPM session is initiated between the first and second clients through a CPM server and the IWF, receiving a session modification request message including specific media from the first client through the CPM server;
• and
• when the specific media is unsupported by the IWF, sending a response message to the CPM server, the response message including a reason for a rejection, which is an indication that the specific media is unsupported by the IWF.

An interworking apparatus for supporting a Converged Internet Protocol (IP) Messaging (CPM) session between a first client subscribing to a CPM service and a second client not subscribing to the CPM service, the interworking apparatus comprising:

• at least one Interworking Function (IWF) for supporting each of at least one media, and generating a reason for a rejection, which is an indication that a corresponding media is unsupported by the IWF, when receiving an interworking request for the media unsupported by the IWF;
• and
• an Interworking Selection Function (ISF) for selecting an entity to undertake interworking of specific media from among the at least one IWF when receiving a session modification request message including the specific media from the first client through a CPM server after the CPM session is initiated between the first and second clients through the CPM server and the IWF.

A session control method in an Interworking Function (IWF) for supporting a Converged Internet Protocol (IP) Messaging (CPM) session between a first client subscribing to a CPM service and a second client not subscribing to the CPM service, the session control method comprising the steps of:

• receiving a session initiation message including specific media from the first client through a CPM server;
• and
• when the specific media is unsupported by the IWF, sending a response message to the CPM server, the response message including a reason for a rejection, which indicates that the specific media is unsupported by the IWF.

An interworking apparatus for supporting a Converged Internet Protocol (IP) Messaging (CPM) session between a first client subscribing to a CPM service and a second client not subscribing to the CPM service, the interworking apparatus comprising:

• at least one Interworking Function (IWF) for supporting each of at least one media, and generating a reason for a rejection, which indicates that a corresponding media is unsupported by the IWF, when receiving an interworking request for the media unsupported by the IWF;
• and
• an Interworking Selection Function (ISF) for selecting an entity to undertake interworking of specific media from among the at least one IWF when receiving a session initiation request message including the specific media from the first client through a CPM server.