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Tunneling Multiplexed Compressed RTP (TCRTP) (RFC4170)

IP.com Disclosure Number: IPCOM000131723D
Original Publication Date: 2005-Nov-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 24 page(s) / 32K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Thompson: AUTHOR [+2]

Related Documents

10.17487/RFC4170: DOI

Abstract

This document describes a method to improve the bandwidth utilization of RTP streams over network paths that carry multiple Real-time Transport Protocol (RTP) streams in parallel between two endpoints, as in voice trunking. The method combines standard protocols that provide compression, multiplexing, and tunneling over a network path for the purpose of reducing the bandwidth used when multiple RTP streams are carried over that path. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 7% of the total text.

Network Working Group B. Thompson Request for Comments: 4170 T. Koren BCP: 110 D. Wing Category: Best Current Practice Cisco Systems November 2005

Tunneling Multiplexed Compressed RTP (TCRTP)

Status of This Memo

This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2005).

Abstract

This document describes a method to improve the bandwidth utilization of RTP streams over network paths that carry multiple Real-time Transport Protocol (RTP) streams in parallel between two endpoints, as in voice trunking. The method combines standard protocols that provide compression, multiplexing, and tunneling over a network path for the purpose of reducing the bandwidth used when multiple RTP streams are carried over that path.

Thompson, et al. Best Current Practice [Page 1]

RFC 4170 Tunneling Multiplexed Compressed RTP November 2005

Table of Contents

1. Introduction ....................................................3 1.1. Is Bandwidth Costly? .......................................3 1.2. Overview of Protocols ......................................3 1.3. Document Focus .............................................4 1.4. Choice of Enhanced CRTP ....................................4 1.5. Reducing TCRTP Overhead ....................................4 2. Protocol Operation and Recommended Extensions ...................4 2.1. Models .....................................................5 2.2. Header Compression: ECRTP ..................................5 2.2.1. Synchronizing ECRTP States ..........................5 2.2.2. Out-of-Order Packets ................................6 2.3. Multiplexing: PPP Multiplexing .............................6 2.3.1. PPP Multiplex Transmitter Modifications for Tunneling ...........................................7 2.3.2. Tunneling Inefficiencies ............................8 2.4. Tunneling: L2TP ............................................8 2.4.1. Tunneling and DiffServ ..............................9 2.5. Encapsulation Formats ......................................9 3. Bandwidth Efficiency ...........................................10 3.1. Multiplexing Gains ........................................10 3.2. Packet Loss Rate ..........................................10 3.3. Bandwidth Calculation for Voice and Video Applications ....10 3.3.1. Voice Bandwidth Calculation Example ................12 3.3.2. Voice Bandwidth Comparison Table ...................13 3.3.3. Video Bandwidth Calculation Example ................13 3.3.4. TCRTP over ATM .....................................14 3.3.5. TCRTP over Non-ATM Networks ........................14 4. Example Implementation of TCRTP ................................15 4.1. Suggested PPP and L2TP Negotiation for TCRTP ..............17 4.2. PPP Negotiation TCRTP .....................................17 4.2.1. LCP Negoti...

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