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Signalling of Modem-On-Hold status in Layer 2 Tunneling Protocol (L2TP) (RFC3573)

IP.com Disclosure Number: IPCOM000016844D
Original Publication Date: 2003-Jul-01
Included in the Prior Art Database: 2003-Jul-18
Document File: 14 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

I. Goyret: AUTHOR

Abstract

The Layer 2 Tunneling Protocol (L2TP) defines a mechanism for tunneling Point-to-Point Protocol (PPP) sessions. It is common for these PPP sessions to be established using modems connected over the public switched telephone network.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 12% of the total text.

Network Working Group                                          I. Goyret

Request for Comments: 3573                           Lucent Technologies

Category: Standards Track                                      July 2003

                   Signaling of Modem-On-Hold status

                  in Layer 2 Tunneling Protocol (L2TP)

Status of this Memo

   This document specifies an Internet standards track protocol for the

   Internet community, and requests discussion and suggestions for

   improvements.  Please refer to the current edition of the "Internet

   Official Protocol Standards" (STD 1) for the standardization state

   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   The Layer 2 Tunneling Protocol (L2TP) defines a mechanism for

   tunneling Point-to-Point Protocol (PPP) sessions.  It is common for

   these PPP sessions to be established using modems connected over the

   public switched telephone network.

   One of the standards governing modem operation defines procedures

   that enable a client modem to put the call on hold and later, re-

   establish the modem link with minimal delay and without having to

   redial.  While the modem call is on hold, the client phone line can

   be used to place or receive other calls.

   The L2TP base protocol does not provide any means to signal these

   events from the L2TP Access Controller (LAC), where the modem is

   physically connected, to the L2TP Network Server (LNS), where the PPP

   session is handled.

   This document describes a method to let the LNS know when a client

   modem connected to a LAC has placed the call on hold.

Goyret                      Standards Track                     [Page 1]

RFC 3573       Signaling of Modem-On-Hold status in L2TP       July 2003

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2

       1.1.  Specification of Requirements. . . . . . . . . . . . . .  3

       1.2.  Terminology. . . . . . . . . . . . . . . . . . . . . . .  3

   2.  Protocol Operation . . . . . . . . . . . . . . . . . . . . . .  3

       2.1.  Typical Modem on Hold Usage Scenario . . . . . . . . . .  4

       2.2.  Capability Negotiation . . . . . . . . . . . . . . . . .  4

       2.3.  Modem On-Hold. . . . . . . . . . . . . . . . . . . . . .  5

       2.4.  Modem Online . . . . . . . . . . . . . . . . . . . . . .  5

   3.  New Control Messages . . . . . . . . . . . . . . . . . . . . .  5

       3.1.  Modem-Status (MDMST) . . . . . . . . . . . . . . . . . .  5

   4.  New Attribute Value Pairs. . . . . . . . . . . . . . . . . . .  6

       4.1.  Modem On-Hold Capable AVP. . . . . . . . . . ....