Pseudo CLLI Gateway for TDM to SIP Voice Conversion
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Solution Overview
Problem
Mobile communication service providers face challenges in receiving calls from networks using different protocols, such as TDM, which are not compatible with SIP, leading to infrastructure and resource maintenance issues when transitioning to SIP-supported networks.
Innovation Solution
A third-party vendor is authorized to receive calls in TDM format on behalf of the mobile communication service provider, converting them to SIP format and handling traffic between mobile communication and LEC networks, using a pseudo CLLI identifier to route calls seamlessly without requiring changes in routing information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile communication networks transition to SIP format, then network compatibility and modernization are improved, but compatibility with legacy TDM infrastructure deteriorates
Solution Approach 1:
The patent introduces a gateway device as an intermediary between TDM and SIP networks. The gateway receives TDM format calls from LEC networks, converts them to SIP format, and routes them to mobile communication networks. This mediator resolves the incompatibility between legacy TDM infrastructure and modern SIP networks, allowing seamless intercommunication without requiring end systems to support multiple protocols.
2Reliability
If TDM infrastructure is maintained for legacy compatibility, then reliability of existing services is preserved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent extracts the TDM protocol handling functionality from the core mobile network infrastructure and places it in a separate gateway device. This allows the mobile network to maintain SIP-only infrastructure while the gateway handles all TDM conversions. By separating these functions, the mobile network reduces its complexity and maintenance burden while preserving legacy service support through the external gateway.
3Reliability
If protocol conversion is implemented at the network core, then service quality is improved, but processing time and resource consumption increase
Solution Approach 1:
The gateway device performs protocol conversion in advance, converting TDM calls to SIP format before they enter the mobile network core. This preliminary conversion allows the mobile network to handle only SIP traffic, eliminating the need for real-time protocol switching during call processing. The conversion overhead is absorbed by the gateway's dedicated conversion capabilities rather than the mobile network's core processing resources.
Data Source
AI summary
A method of voice communication between a mobile communication network and a local exchange carrier (LEC) network. The method comprising receiving, at a network switch, a voice call data stream in time-division multiplexing (TDM) format. The voice call data stream is addressed to a pseudo COMMON LANGUAGE (CLLI) identifier. The network switch is connected to a TDM trunk and a session initiation protocol (SIP) trunk. The network switch is associated with a vendor CLLI identifier and the pseudo CLLI identifier. The method comprises converting, by the network switch, at least a first portion of the voice call data stream into a SIP data stream and, transmitting, the SIP data stream to a session border controller of a mobile communication service provider, where the session border controller is configured to transmit the SIP data stream to an internal network switch associated with the pseudo CLLI identifier.