SIP-T Bearer Modification for Fax Modem Interworking
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Solution Overview
Problem
Current systems cannot efficiently transmit call control parameters between media gateway controllers using the SIP protocol, especially when modifying bearers for fax or modem transmissions, due to the lack of interworking between SIP and BICC CS2/ISUP+ interfaces.
Innovation Solution
The method involves converting call control parameters into the SIP or SIP_T protocol and mapping them into the Session Description Protocol (SDP) level or Bearer Application Transport (BAT) Q.765 level for bearer-independent signaling, allowing information exchange between media gateway controllers using SIP, SIP-T, or BICC CS2/ISUP+ interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If call control parameters are transmitted using BICC CS2/ISUP+ interface, then reliable telecommunication network signaling is achieved, but interworking with SIP/SIP-T networks and extended service management solutions are limited
Solution Approach 1:
The patent introduces an intermediary conversion mechanism that translates between BICC CS2/ISUP+ signaling parameters and SIP/SIP-T protocol messages. This mediator enables interworking between the traditional telecommunication network and IP-based networks without requiring direct compatibility, thus resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent creates a universal signaling framework that can handle both traditional BICC CS2/ISUP+ telecommunication signaling and modern SIP/SIP-T IP-based signaling through a common interface. This multi-functional approach allows the system to maintain reliability for legacy services while gaining versatility for extended service management solutions.
2Ease of manufacture
If connection setup and bearer setup are separated, then cost optimization is achieved, but efficient transmission of call control parameters for bearer modification is hindered
Solution Approach 1:
The patent maintains the segmentation of connection setup and bearer setup as separate processes, which enables cost optimization. Simultaneously, it provides efficient bearer modification mechanisms through dedicated signaling procedures that can modify bearers without requiring full connection re-establishment, thus resolving the productivity concern.
Solution Approach 2:
The patent introduces dynamic bearer modification capabilities that allow the system to adapt bearer parameters during active connections based on service requirements. This dynamic approach enables efficient handling of fax and modem transmissions without sacrificing the cost benefits of separated setup procedures.
3Adaptability or versatility
If SIP protocol is used for media gateway controller intercommunication, then extended service management and multimedia session support are achieved, but reliable transmission of call control parameters is compromised
Solution Approach 1:
The patent employs an intermediary conversion layer that translates SIP protocol messages into reliable BICC CS2/ISUP+ signaling for critical call control parameters. This mediator ensures that the reliability requirements of traditional telecommunication signaling are maintained even when using the more versatile SIP protocol for extended services.
Solution Approach 2:
The patent applies different quality requirements to different parts of the signaling process. Critical call control parameters transmitted via SIP are enhanced with additional reliability mechanisms, while other service management information can use standard SIP procedures. This local quality approach resolves the contradiction between versatility and reliability.
Data Source
AI summary
The invention relates to a method for the transmission of call control parameters for switching over between a voice transfer mode and a data transfer mode between two media gateway controllers (6, 7), which are used by way of an IP network between two telecommunication terminal devices separated from any medium or bearer connection, whereby the call control parameters are transferred with conversion into the SIP or SIP_T protocol or from this into a standard signaling protocol.