SIP B2BUA Line Appearance Segmentation
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Solution Overview
Problem
Current SIP-based telecommunications networks face limitations in the number of line appearances due to resource-intensive registration processes and large INVITE messages, which reduce network capacity and lead to speech clipping issues.
Innovation Solution
Implementing a Back to Back User Agent (B2BUA) that manages communications by only registering primary line appearances and using NOTIFY messages for incoming calls, with a media negotiator to establish early media, reducing resource consumption and eliminating the need for secondary and phantom lines to register.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all line appearances are registered with the network to ensure complete call routing coverage, then call routing reliability is improved, but network resource consumption and processing overhead increase significantly
Solution Approach 1:
The patent segments line appearances into two categories: primary appearances that are registered with the network, and secondary/phantom appearances that are not registered. This segmentation allows the system to maintain reliable call routing for primary appearances while reducing overall registration overhead and resource consumption by excluding secondary appearances from the registration process.
Solution Approach 2:
The patent introduces a B2BUA (Back-to-Back User Agent) as an intermediary component that manages the distinction between registered primary appearances and unregistered secondary appearances. The B2BUA acts as a mediator that can still route calls to secondary appearances through the registered primary appearance, thereby maintaining routing reliability without requiring all appearances to be registered.
2Reliability
If INVITE messages are sent to every line appearance to ensure complete call delivery, then call delivery completeness is improved, but processing time and resource consumption increase
Solution Approach 1:
The patent extracts secondary and phantom line appearances from the INVITE message distribution process. Instead of sending INVITE messages to all line appearances, the system only sends INVITE messages to registered primary appearances. The B2BUA then handles the distribution of calls to secondary appearances associated with the primary appearance, thereby reducing processing time and resource consumption while maintaining complete call delivery.
3Productivity
If the number of registered line appearances is increased to support more endpoints, then network capacity is improved, but resource consumption and processing overhead increase
Solution Approach 1:
The patent enables the network to support more line appearances by segmenting them into registered primary appearances and unregistered secondary appearances. This allows the network capacity to effectively increase as more secondary appearances can be associated with primary appearances without requiring additional registration resources, thereby improving productivity while controlling resource consumption.
Data Source
AI summary
A communications system and method of managing communications with multiple appearance endpoints, e.g. Session Initiation Protocol (SIP) endpoints in the communications system. At least one SIP endpoint includes a keyset with multiple lines, at least a primary line and one or more secondary and/or phantom lines. A Back to Back User Agent (B2BUA) manages communications with the SIP endpoints and multiple (e.g., all) line appearances register in a single REGISTER message sent by the primary line to the B2BUA. The B2BUA sends NOTIFY messages for any incoming call and once the call is answered sends an INVITE message to the answering endpoint. The B2BUA includes a media negotiator that negotiates early media with the SIP endpoints upon an indication of a pending call, incoming or outgoing.