Floating User Agents for SIP Gateway Integration
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Solution Overview
Problem
SIP communication systems face challenges in providing uniform features and interfaces to both internal and external communication endpoints, leading to inefficiencies and increased costs due to the need for separate interfaces for external devices.
Innovation Solution
The introduction of 'floating' user agents that can associate with external communication endpoints, allowing them to interact with SIP-enabled networks and provide similar features to internal devices, by instantiating on gateways between internal and external networks, and dynamically determining their identity and mapping on a per-call basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate interfaces are created for external devices, then external devices can be supported, but system complexity and cost increase
Solution Approach 1:
The patent implements a universal user agent architecture where a single user agent can function as both a SIP user agent and a PSTN user agent. This allows the same interface to handle both internal SIP devices and external PSTN devices, eliminating the need for separate interfaces and reducing system complexity while maintaining support for multiple device types
Solution Approach 2:
The gateway acts as an intermediary between the SIP network and external PSTN networks. By placing the user agent at the gateway, the system mediates between different protocols and interfaces, allowing external devices to be represented similarly to internal devices without requiring separate interface implementations
2Ease of operation
If floating user agents are implemented, then external devices can be represented similarly to internal devices, but system complexity increases
Solution Approach 1:
The user agent is implemented as a dynamic, floating entity that can be instantiated on any gateway as needed. Rather than being statically assigned to a specific gateway, the user agent dynamically associates with the gateway that receives the call, allowing uniform interface access while managing complexity through on-demand instantiation
Solution Approach 2:
The floating user agent creates a virtual representation of the external device within the SIP network. This copy allows internal SIP devices to interact with external devices through a uniform interface, while the actual external device remains outside the SIP network, managing complexity by working with virtual representations rather than direct connections
3Ease of operation
If user agents are locked to specific gateways, then call handling is simplified, but flexibility to manage incoming calls is reduced
Solution Approach 1:
The system performs preliminary registration of the floating user agent with the SIP proxy before calls arrive. This preliminary action allows the user agent to be available for call handling without being permanently locked to a specific gateway, maintaining both ease of operation during calls and flexibility in gateway selection when calls are received
Data Source
AI summary
A call processing system includes a call processing server. The call processing server processes calls for an internal network that employs SIP features and functions. The call processing server can receive calls from or send calls to one or more external communication endpoints that are not part of the internal network. However, the call processing server can associate a floating user agent with the communication from the external communication endpoint and lock the floating user agent to a gateway. After locking onto a gateway and initiating the call, the floating user agent can then publish call event status and receive SIP primitives similar to other SIP-enabled devices.