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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.

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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. . . . . . . . . . ....