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 3.4.3 Management Allow Traffic Event 36 3.4.4 Management Prohibit Traffic Event 36 3.5 Other Implementation Dependent TALI Events 37 3.6 TALI States 37 3.7 TALI Version 1.0 State Machine 38 3.7.1 State Machine Concepts 38 3.7.1.1 General Protocol Rules 38 3.7.1.2 Graceful Shutdown of a Socket 39 3.7.1.3 TALI Protocol Violations 39 Sprague, et al. Informational