RFC 3573 (rfc3573) - Page 1 of 13

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

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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
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