H.245 Session Termination in IMS-CS Interworking
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Solution Overview
Problem
In multimedia communication systems, the normal release of calls between H.324 and SIP networks is not ensured when the call release is initiated by the SIP network side or the MGC, leading to incomplete termination of H.245 sessions and resource wastage.
Innovation Solution
A method and system that terminate the H.245 session at the media control device or media processing device when a call release is initiated by the SIP network side or MGC, ensuring proper release of bearers and session endpoints, using a media control device with H.245 session end and call release units to manage the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the call release is initiated by the SIP network side or MGC, then the call release process can be started, but the H.245 session cannot be terminated normally leading to incomplete release
Solution Approach 1:
The patent applies preliminary action by detecting the release cause at the beginning of the call release process and proactively determining whether H.245 session termination is needed before the release proceeds. This early detection and judgment mechanism ensures that the H.245 session termination instruction is issued in advance when necessary, preventing the session from remaining in an incomplete state and ensuring reliable call release without adding complex post-release handling procedures.
2Loss of energy
If the H.245 session is not terminated when call release is initiated by SIP side or MGC, then the call release process is simple, but resources are wasted due to incomplete session termination
Solution Approach 1:
The patent implements feedback by continuously monitoring the release cause information and using this feedback to dynamically determine whether H.245 session termination is required. The system receives feedback from the release initiation event, processes it through the judgment mechanism, and adjusts the release procedure accordingly. This feedback-driven approach ensures that H.245 sessions are terminated precisely when needed (avoiding resource wastage) while maintaining efficient processing by not adding unnecessary termination steps when not required.
Data Source
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AI summary
Methods and systems for releasing call during the interoperation of the multimedia services under a bearer independent network are provided. When the call release is caused by a first network side which does not employ H.245 protocol to control the media stream or the device having interoperation function, the H.245 session may be terminated by a media control device and a media processing device. After the session ends, the device having the interoperation function instructs the network side which has not released the call to release the call, releases the bearer on the media processing device and deletes the corresponding session endpoint. Accordingly, when the IMS network and the CS network are interworking multimedia services, the present invention ensures to terminate the H.245 session first when releasing the multimedia call in the situations where the call release is invoked by the terminal on SIP side or the MGC initiating the call release, or by the MG reporting the release of the bearer of the SIP side. In addition, the H.245 session may be ended by instructions of closing the specified logic channel first and then transmitting an ESC (End Session Command) message.