H.323 to SIP Interworking Gateway for Call Forwarding
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Solution Overview
Problem
Current interworking solutions between H.323 and SIP protocols only support basic call connections, failing to provide interworking for supplementary features such as call forward and redirection, which are essential for seamless communication between devices using different protocols.
Innovation Solution
A gateway system that maps SIP 3xx messages to H.450.3 messages and vice versa, enabling call forward and redirection between H.323 and SIP end devices by parsing and generating interworking information to facilitate communication across different protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If basic interworking connections are implemented between H.323 and SIP protocols, then basic call connections are enabled, but supplementary features such as call forward and redirection are not supported
Solution Approach 1:
The patent introduces an H.323 gateway as an intermediary device between H.323 and SIP networks. The gateway translates H.450.3 call forwarding messages into SIP 3xx redirection messages and vice versa, enabling supplementary features to work across protocol boundaries. This mediator approach resolves the contradiction by maintaining basic connection compatibility while recovering lost supplementary feature functionality through protocol translation.
2Adaptability or versatility
If protocol-specific supplementary features are implemented in H.323 or SIP, then feature functionality is provided, but interworking between different protocols fails
Solution Approach 1:
The H.323 gateway is designed with multi-functionality to handle both basic call connections and supplementary features like call forwarding and redirection. It performs multiple roles: basic protocol translation, H.450.3 to SIP 3xx message mapping, and feature interworking. This universal design resolves the contradiction by enabling a single device to handle diverse functions across protocols without requiring separate specialized systems for each feature.
3Adaptability or versatility
If H.450.3 messages are mapped to SIP 3xx messages for call forward, then call forward functionality is enabled between protocols, but message format and protocol differences create interworking challenges
Solution Approach 1:
The gateway applies parameter changes by mapping H.450.3 message parameters to corresponding SIP 3xx message parameters. It transforms the message format, parameter structure, and protocol syntax while preserving the semantic meaning of call forwarding instructions. This parameter transformation approach resolves the contradiction by adapting message parameters to different protocol requirements while maintaining functional equivalence.
Data Source
AI summary
In a particular embodiment, interworking between an H.323 protocol and SIP protocol for a call forward/redirection is provided. A first user may call a second user. The second user may have set preferences that cause a call redirection/forward to another end device. The end device may be associated with the second user or another user. Different preferences for the call forward/redirection may be provided. For example, a call may be forwarded all the time, when the second end device is busy, when there is no answer, etc. The redirection may then be performed using a gateway. When end devices communicate using SIP and H.323, the gateway provides interworking to provide the call forward/redirection. For example, the gateway maps a 3xx message in SIP to an H.450.3 message in the H.323 protocol, and vice versa, to provide the call forward/redirection.