Tekelec's Transport Adapter Layer Interface
RFC 3094

Document Type RFC - Informational (April 2001; No errata)
Last updated 2013-03-02
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Network Working Group                                         D. Sprague
Request for Comments: 3094                                    R. Benedyk
Category: Informational                                       D. Brendes
                                                               J. Keller
                                                                 Tekelec
                                                              April 2001

              Tekelec's Transport Adapter Layer Interface

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

IESG Note:

   Readers should note that this memo presents a vendor's alternative to
   standards track technology being developed by the IETF SIGTRAN
   Working Group.  The technology presented in this memo has not been
   reviewed by the IETF for its technical soundness or completeness.
   Potential users of this type of technology are urged to examine the
   SIGTRAN work before deciding to use the technology described here.

Abstract

   This document proposes the interfaces of a Signaling Gateway, which
   provides interworking between the Switched Circuit Network (SCN) and
   an IP network.  Since the Gateway is the central point of signaling
   information, not only does it provide transportation of signaling
   from one network to another, but it can also provide additional
   functions such as protocol translation, security screening, routing
   information, and seamless access to Intelligent Network (IN) services
   on both networks.

   The Transport Adapter Layer Interface (TALI) is the proposed
   interface, which provides TCAP (Transaction Capability Application
   Part), ISUP (ISDN User Part), and MTP (Mail Transport Protocol)
   messaging over TCP/IP.  In addition, TALI provides SCCP (Signalling
   Connection Control Part) Management (SCMG), MTP Primitives, dynamic
   registration of circuits, and routing of call control messages based
   on circuit location.

Sprague, et al.              Informational                      [Page 1]
RFC 3094      Tekelec's Transport Adapter Layer Interface     April 2001

Table of Contents

   1. Introduction                                                    4
   2. Overview of the TALI Protocol                                   6
   2.1 Traditional PSTN SS7 Networks                                  6
   2.2 Converged SS7 Networks                                         8
   2.3 TALI Protocol Stack Overview                                  10
   2.3.1 An Alternate TALI Protocol Stack using the SAAL Layer       13
   2.3.2 An Alternate TALI Protocol Stack using SCTP                 15
   2.4 Inputs to the TALI Version 1.0 State Machine                  15
   3. TALI Version 1.0                                               17
   3.1 Overview of the TALI Message Structure                        17
   3.1.1 Types of TALI Fields                                        19
   3.2 Detailed TALI Message Structure                               20
   3.2.1 TALI Peer to Peer Messages                                  20
   3.2.1.1 Test Message (test)                                       20
   3.2.1.2 Allow Message (allo)                                      21
   3.2.1.3 Prohibit Message (proh)                                   21
   3.2.1.4 Prohibit Acknowledgement Message (proa)                   21
   3.2.1.5 Monitor Message (moni)                                    22
   3.2.1.6 Monitor Acknowledge Message (mona)                        22
   3.2.2 Service Messages                                            23
   3.2.2.1 SCCP Service Message (sccp)                               23
   3.2.2.1.1 SCCP Encapsulation using TALI                           25
   3.2.2.2 ISUP Service Message (isot)                               27
   3.2.2.2.1 ISUP Encapsulation using TALI                           27
   3.2.2.3 MTP3 Service Message (mtp3)                               28
   3.2.2.3.1 MTP3 Encapsulation using TALI                           29
   3.2.2.4 SAAL Service Message (saal)                               30
   3.2.2.4.1 MTP3 and SAAL Peer to Peer Encapsulation using TALI     31
   3.3 TALI Timers                                                   34
   3.3.1 T1 Timer                                                    34
   3.3.2 T2 Timer                                                    34
   3.3.3 T3 Timer                                                    34
   3.3.4 T4 Timer                                                    34
   3.3.5 Recommended Defaults and Ranges for the TALI Timers         35
   3.4 TALI User Events                                              35
   3.4.1 Management Open Socket Event                                35
   3.4.2 Management Close Socket Event                               36
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