T-BCSM Terminating Basic Call State Model

T-BCSM (Terminating Basic Call State Model) is a signaling model used in telecommunication networks to handle call termination processes. It defines the sequence of events and actions involved in terminating a call session, allowing for proper call teardown and signaling between network elements.

Overview of T-BCSM:

T-BCSM is part of the Intelligent Network (IN) architecture and is specifically focused on call termination. It is a standardized model that defines the behavior and interaction between different network elements involved in terminating a call, such as switches, service control points (SCPs), and databases.

Functionality of T-BCSM:

The functionality of T-BCSM involves the following key aspects:

1. Call Release Trigger: T-BCSM monitors call-related events and triggers the call release process when certain conditions are met. These triggers include normal call completion, call failure, user-initiated call termination, or network-initiated termination due to an error or congestion.
2. Handling of Call Release: When a call release trigger is activated, T-BCSM initiates the call teardown process. This includes sending appropriate signaling messages to notify all relevant network elements involved in the call, such as the calling party, called party, switches, and service control points.
3. Supplementary Services: T-BCSM supports the handling of supplementary services during call termination. These services may include call forwarding, call waiting, call transfer, call hold, and other service features that need to be properly handled before terminating the call.
4. Call Record Generation: T-BCSM is responsible for generating call records or Call Detail Records (CDRs) that capture relevant information about the terminated call. These records may include details such as call duration, call type, calling and called party numbers, service used, and any supplementary services invoked during the call.
5. Error Handling: T-BCSM provides error handling mechanisms for exceptional cases, such as network failures, signaling errors, or unexpected events during call termination. It ensures appropriate error reporting, logging, and recovery procedures are followed to maintain the integrity of the call termination process.

Interactions with Other Call State Models:

T-BCSM interacts with other call state models defined in the IN architecture to handle various aspects of call setup and control. Some important interactions include:

1. O-BCSM (Originating Basic Call State Model): T-BCSM and O-BCSM work together to handle the complete call lifecycle. O-BCSM is responsible for call setup and establishment, while T-BCSM takes over when it comes to call termination.
2. I-BCSM (Intermediate Basic Call State Model): I-BCSM is involved in call routing and intermediate stages of the call lifecycle. It interacts with both O-BCSM and T-BCSM to facilitate call routing decisions and handle call transfers or call forwarding.

Benefits of T-BCSM:

T-BCSM offers several benefits in call termination processes:

1. Standardization: T-BCSM provides a standardized model for call termination in telecommunication networks. This ensures consistent behavior across different network elements and facilitates interoperability between different vendors' equipment.
2. Efficient Call Teardown: T-BCSM defines a sequence of events and signaling procedures for call termination, ensuring efficient and accurate call teardown. It enables proper handling of signaling messages, notifications to relevant network elements, and graceful release of call resources.
3. Supplementary Service Support: T-BCSM supports the handling of supplementary services during call termination. This allows for the proper handling of service features requested by users, ensuring a seamless user experience during call termination.
4. Call Record Generation: T-BCSM generates call records or CDRs that capture important information about the terminated call. These records are crucial for billing, call analysis, network optimization, and maintaining service quality.

Conclusion:

T-BCSM (Terminating Basic Call State Model) is a signaling model in telecommunication networks that defines the sequence of events and actions involved in terminating a call session. It handles call release triggers, ensures proper call teardown, supports supplementary services, generates call records, and facilitates error handling during call termination. T-BCSM plays a crucial role in the Intelligent Network architecture, enabling efficient and standardized call termination processes across different network elements.