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DPN-100 DPN Call Redirection System User Guide 241-1001-115 DPN-100 DPN Call Re

DPN-100 DPN Call Redirection System User Guide 241-1001-115 DPN-100 DPN Call Redirection System User Guide Publication: 241-1001-115 Document status: Standard Document version: 37.2S1 Document date: February 2001 Copyright © 1986 - 2001 Nortel Networks. All Rights Reserved. Printed in Canada NORTEL, NORTEL NETWORKS, the globemark design, the NORTEL NETWORKS corporate logo, DPN, and PASSPORT are trademarks of Nortel Networks 5 DPN-100 DPN Call Redirection System User Guide 37.2S1 List of revised pages The following is a list of documentation revisions for service requests (SR) or release reports, or both: Updates: Page 16, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 31, 32, 34, 35, 37, 39, 42, 43, 44, 45, 47, 48, 51, 52, 53, and 57. 6 List of revised pages 241-1001-115 37.2S1 7 DPN-100 DPN Call Redirection System User Guide 37.2S1 Publication history February 2001 37.2S1 Standard Commercial availability 8 Publication history 241-1001-115 37.2S1 9 DPN-100 DPN Call Redirection System User Guide 37.2S1 Contents About this document 15 Who should read this document 15 What you should know 15 How this document is organized 15 Typographic conventions 15 Related documents 16 Chapter 1 Introduction to call redirection 17 Why call redirection is required 17 Beneﬁts of call redirection 17 When call redirection is required 17 Internal failures 18 External failures 18 Other failures 18 How call redirection works 18 Routing identiﬁer (RID) redirection 19 DNA redirection 22 Data network identiﬁcation code (DNIC) redirection 27 Chapter 2 Components of the call redirection system 31 Introduction 31 Call redirection remote server interface 31 Call redirection server on an AM or RM 32 DNIC redirection 33 DNA Redirection 34 Initialization of SVCs 35 SVC setup on an RM 35 Interaction with other systems 37 Interaction with hunt groups 37 PVC back-up description 37 Limitations 39 10 241-1001-115 37.2S1 Chapter 3 Operations 41 Introduction 41 Call redirection system operator commands 42 DPN AM/RM operator commands 42 DPN RM operator commands 42 Call redirection system service data 42 DPN AM/RM redirection service data 43 DPN RM CRD-RSI service data 44 Alarms 44 Accounting 45 Statistics 45 Chapter 4 Provisioning the servers 47 Related documents 48 Provisioning Access to Call Redirection 48 Before you begin 48 Service data entry ﬁelds 50 Steps to follow when provisioning Access to Call Redirection 51 Provisioning Call Redirection 52 Before you begin 52 Service data entry ﬁelds 54 Steps to follow when provisioning Call Redirection 56 Index 59 Contents 11 DPN-100 DPN Call Redirection System User Guide 37.2S1 List of figures Figure 1 RM RID redirection - RID failure 20 Figure 2 RM RID redirection - network link failure 21 Figure 3 DNA redirection - RM 24 Figure 4 DNA redirection - RM 25 Figure 5 Flow of DNA redirection with alternate path defined 26 Figure 6 DNIC redirection 28 Figure 7 DNIC redirection list - call redirection server 33 Figure 8 DNA redirection list 34 Figure 9 SVC initialization 36 Figure 10 PVC backup 38 Figure 11 Reconnecting primary slave end of a PVC 39 12 Contents 241-1001-115 37.2S1 List of tables Table 1 Hierarchy: Access to Call Redirection components 48 Table 2 ACRD service data fields 50 Table 3 Hierarchy: Call Redirection server components 52 Table 4 Hierarchy: Call_Redirection_Server using the PE_Combination_Server 53 Table 5 Hierarchy: Call Redirection list components 53 Table 6 Call_Redirection server data fields 55 Table 7 Call_Redirection list data fields 56 Contents 13 DPN-100 DPN Call Redirection System User Guide 37.2S1 List of procedures Procedure 1 How to add Access to Call Redirection to an RM 51 Procedure 2 How to add Access to Call Redirection to an existing RMSERVER PE 51 Procedure 3 How to add the Call Redirection server 57 Procedure 4 How to add the Call_Redirection_Server using the PE_Combination_Server component 57 14 Contents 241-1001-115 37.2S1 15 DPN-100 DPN Call Redirection System User Guide 37.2S1 About this document This document provides the reader with an introduction to call redirection and an outline of how the DPN Call Redirection System works. Details on how to provision the server are also provided. Who should read this document This document was written for customers interested in obtaining the Call Redirection System (CRD) for a network. The document is also intended for network operators who set up and modify the CRD on a switch. What you should know Before you read this document you should have a basic understanding of the DPN network. Also, you should be familiar with the DPN Architect provisioning applications. How this document is organized This document is organized into four chapters: • Chapter 1, “Introduction to call redirection” provides an introduction to the Call Redirection (CRD) system and describes the ﬂow of a call through the system. • Chapter 2, “Components of the call redirection system” provides a description of the system components. • Chapter 3, “Operations” provides an outline of the Operations, Administration, and Maintenance aspects of the system. • Chapter 4, “Provisioning the servers” explains how to provision both the Access to Call Redirection (ACRD) server and the Call Redirection (CRD) server. Typographic conventions The following conventions are used in this document: Plain text in courier font: plain text in courier font that occurs in procedures represents system generated text or text that appears on your screen. 16 About this document 241-1001-115 37.2S1 Bold text: bold text in courier font that appears in a procedure represents words that you should type or that you should select on the screen. Italics: words that appear in italics in a procedure explain the results of a particular step and appear immediately following that step. Words that appear in italic in paragraphs represent words that are special or that need to be highlighted. [optional_parameter]: words in square brackets represent optional parameters. The command can be entered with or without the words in the square brackets. <general_term>: words in angle brackets represent general terms which are to be replaced with speciﬁc numeric values. UPPERCASE, lowercase: uppercase and lowercase letters that appear in commands and parameters must be matched exactly. The system matches upper and lowercase characters differently unless otherwise stated. Related documents The following publications are referred to in this document: • NTP 241-1001-110, DPN Routing System General Description • NTP 241-1001-153 DPN System Engineering Guidelines • NTP 241-1001-183 Addressing Plan • NTP 241-1001-303 Operator Commands and Responses • NTP 241-2001-340 Envelope Deﬁnitions Other relevant documents are as follows: • NTP 241-1001-506 Alarm Console Indications • NTP 241-1001-509 Call Clear, Reset and Diagnostic Codes • NTP 241-1001-117 DPN AM/RM Hunt Group Server User Guide 17 DPN-100 DPN Call Redirection System User Guide 37.2S1 Chapter 1 Introduction to call redirection This chapter provides an introduction to the Call Redirection system and describes the ﬂow of a call through the system. The information in this chapter is ordered as follows: • Why call redirection is required • When call redirection is required • How call redirection works Why call redirection is required Call Redirection is required in a network to route calls to alternate destinations if the primary destination is not available. This allows subscribers to achieve higher reliability on data communication paths by providing one or more redundant paths for call attempts. Beneﬁts of call redirection The DPN Call Redirection System provides the following beneﬁts: • high capacity • high performance • isolated change management • enhanced administration capabilities When call redirection is required The Call Redirection System is invoked when a destination is not available due to a failure. There are three types of failures: internal, external, and other failures. To re-route a call that has been signalled on the link by the X.25 service, the host must initiate the ITU X.25 Call Deﬂection feature using an X.25 facility code. 18 Chapter 1 241-1001-115 37.2S1 Internal failures An internal failure occurs in switch hardware when some internal component fails. These failures could occur in: • line cards • processors • shelves • nodes • network links • trunks External failures External failures occur outside the switch. These failures could occur in • customer data terminal equipment (DTE) • customer connections to the switch Other failures Call routing failures may not always be due to a failed component or link. One example is when the call options speciﬁed by the calling end are not compatible with those supported by the called end. Another example is when the called end is busy (that is, no free channels for the incoming call). How call redirection works Three types of call redirection are performed: • Routing Identiﬁer (RID) Redirection, for routing around switch or network failures. • Data Network Address (DNA) Redirection, for routing calls to alternate destinations within the same network. • Data Network Identiﬁcation Code (DNIC) Redirection for routing to other networks. RID redirection will always be attempted ﬁrst. If it fails, DNA redirection or DNIC redirection will be attempted. In order to perform these redirection functions, the following entities are required in the network: • a Call Redirection Remote Server Interface on each RM in the network; and • a uploads/s1/ dpn-call-redirection-system-user-guide.pdf