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Understanding SIP-T Contexts and Architectures: Roles, Responsibilities, and Interconnections

This document outlines the contexts and architectures relevant to SIP-T (Session Initiation Protocol for Telephony). It details the roles and responsibilities of various network entities involved in PSTN-IP interconnections, focusing on SIP bridging, encapsulation, and translation issues for both origination and termination. The paper also addresses feature transparency, MGC functionalities for ingress and egress, and critical problems like ISUP repetition and SIP MIME type negotiation. This comprehensive overview aims to facilitate a better understanding of SIP-T operations.

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Understanding SIP-T Contexts and Architectures: Roles, Responsibilities, and Interconnections

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  1. SIP-T: Context and Architectures Aparna Vemuri Jon Peterson Level (3) Communications

  2. Introduction • Context and architectures for SIP-T (draft-vemuri-sip-t-context-00.txt) • Roles and responsibilities of network entities • Issues for consideration

  3. Purpose Feature transparency • Encapsulation • Translation

  4. PSTN-IP Interconnections PSTN origination - PSTN termination (SIP bridging) • ingress MGC • perform encapsulation • perform translation • egress MGC • interpret body • generate ISUP

  5. PSTN-IP Interconnections PSTN origination - IP termination • MGC • perform encapsulation • perform translation • IP end-point • ignore ISUP

  6. PSTN-IP Interconnections IP origination - PSTN termination • IP end-point • originate SIP • MGC • generate ISUP

  7. Issues • SIP MIME type negotiation • “ISUP repetition” problem

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