Interworking Supplementary Call Services Between VoIP Protocols
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Solution Overview
Problem
Current interworking solutions for Voice over Internet Protocol (VOIP) systems do not adequately support supplementary services, such as call forwarding and transfer, between end devices using different communication protocols like H.323 and SIP, limiting their functionality.
Innovation Solution
A gateway system that interworks between H.323 and SIP protocols by converting messages, such as SIP REFER and H.323 ECS messages, to facilitate call transfers and supplementary services, enabling seamless communication across different VOIP protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If basic interworking models for H.323 and SIP protocols are implemented, then call connection between different protocols is supported, but supplementary services functionality is limited
Solution Approach 1:
The patent introduces a gateway as an intermediary component that mediates between H.323 and SIP protocols. The gateway translates H.450 supplementary service messages into equivalent SIP messages and vice versa, enabling supplementary services to function across protocol boundaries without requiring direct H.450 support in the non-H.450 network domain.
Solution Approach 2:
The gateway is designed to handle multiple functions: basic call setup, supplementary service translation, and protocol conversion. By making the gateway multi-functional, the system can support both H.323 and SIP endpoints with full supplementary services capability through a single interworking component.
2Adaptability or versatility
If H.450 supplementary service standards are used for H.323, then call services such as call forward and transfer are supported, but interworking in non-H.450 communication framework is not provided
Solution Approach 1:
The gateway serves as a protocol translation intermediary that converts H.450 supplementary service messages into SIP-compatible messages. This allows H.323 endpoints using H.450 standards to interact with SIP endpoints without requiring the SIP side to implement H.450, thus achieving framework compatibility while managing complexity centrally in the gateway.
Solution Approach 2:
The gateway transforms message parameters and structures between H.450 and SIP protocols. By changing the parameter format, message structure, and service indication methods to match the target protocol's expectations, the system achieves compatibility across different communication frameworks.
Data Source
AI summary
A method for interworking supplementary call services between different VOIP protocols is provided. The method comprises receiving, during a call between a first end device and a second end device, a first message in a first protocol format for the second end device to transfer the call to a third end device; determining interworking information to interwork the first message to a second message in a second protocol format; generating the second message based on the interworking information, such that the second message initiates the call transfer to the third end device.