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Distributed Communications System B Private Networking ISDN/X.25 gateway DEFINITY ECS can serve as an interface between PBXs that support the D-channel signaling feature and those that do not support this feature. The switch providing this interface is known as the ISDN-DCS Gateway node and provides backward compatibility to existing traditional DCS networks. It maintains a mapping between processor channels and Administered NCA-TSCs. When a DCS D-channel message arrives on an Administered NCA-TSC acting as a gateway, it is converted to a traditional DCS message and sent out through the processor channel that has been administered to map to this Administered NCA-TSC. Likewise, when a traditional DCS message arrives at the gateway node on a processor channel acting as a gateway, it is converted to a DCS D-channel message and sent out through the Administered NCA-TSC that has been associated with this processor channel on the ISDN Gateway Channel form. In summary, a gateway is required whenever a transition is being made from BX.25 signaling to D-channel signaling. When the transition takes place at a switch that sits between that part of the network that supports D-channel DCS and that part that does not, that switch is an ISDN-DCS Gateway. A DCS network consisting entirely of switches that support D-channel DCS never requires an ISDN-DCS Gateway because none of the switches require “translation” to/from BX.25. DCS Over ISDN-PRI D-channel DCS Over ISDN-PRI D-channel (DCS+) enhances DCS by allowing access to the public network for DCS connectivity between DCS switch nodes. With this feature, DCS features are no longer restricted to private facilities. The ISDN-PRI B-channel is used for voice communications, and the ISDN-PRI D-channel transports DCS control information. DCS Over ISDN-PRI utilizes the Message-Associated User-to-User Information (MA-UUI) and Temporary Signaling Connections (TSC) to transport certain DCS control information. MA-UUI allows additional user-specific information to be transported along with certain ISDN call-control messages. Note: Use this feature only over DS1/E1 or T1 circuit packs that are administered to Country Protocol Option 1, Protocol Version A (even in a private network environment) independent of what country the system is in. 320 Administration for Network Connectivity CID: 77730 555-233-504 — Issue 1 — April 2000
Distributed Communications System B Private Networking How to administer DCS Over ISDN-PRI D-channel Form Field Signaling Group • Max number of NCA TSC • Max number of CA TSC • Trunk Group for NCA TSC ISDN TSC Gateway Channel Assignments Trunk Group (ISDN-PRI) • Administered NCA TSC Assignment fields • Service/Feature • Inactivity Time-out (min) • All Route Pattern • TSC Processor Channel Assignment Feature-Related System Parameters • Used for DCS Node Number DCS Signaling • NCA TSC Trunk Member • CA TSC Request • Application • Record TSCs for CDR Note: There are several differences in administration between switches. For example, PRI is translated a little differently in G3r when traditional DCS and this feature are used in combination. On systems with AUDIX in a DCS environment, an additional column has been added to the Signaling Group form so you can specify which AUDIX and switch to use. When traditional DCS and DCS over ISDN are used in combination, translations are also different. Detailed description A TSC provides a temporary signaling path through ISDN switches for exchanging supplementary service information on ISDN-PRI D-channels. There is no B-channel related to the connection; no data or voice transmissions take place. There are two types of temporary signaling connections: • Call Associated (CA-TSC) • Non-Call Associated (NCA-TSC) CA-TSC A CA-TSC refers to a service for exchanging USER INFORMATION messages associated with an ISDN B-channel connection by the call reference value of the call control data packets. On DEFINITY ECS, this type of TSC is used only for DCS features on ISDN-PRI Signaling Groups administered with Supplementary Service Protocol a. Administration for Network Connectivity 555-233-504 — Issue 1 — April 2000 CID: 77730 321
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DEFINITY ® Enterprise Communicatio
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Contents Preface Purpose. . . . . .
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Contents Switch-Node 3 Administrati
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Contents QSIG . . . . . . . . . . .
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Preface This book describes how to
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Issue Status Preface ppp Data Modul
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Issue Status Preface Reorganization
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Terminology Preface Terminology The
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Tell us what you think Preface Tell
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Trademarks Preface Trademarks The f
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1 Networking Overview This chapter
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DEFINITY Switch Connectivity 1 Netw
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IP Softphones 1 Networking Overview
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IP Addressing 1 Networking Overview
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2 H.323 Trunks This chapter describ
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H.323 Trunk Administration 2 H.323
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Troubleshooting IP Solutions 2 H.32
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3 C-LAN Administration This chapter
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Overview 3 C-LAN Administration ✔
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Overview 3 C-LAN Administration TCP
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Overview 3 C-LAN Administration Int
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Configuration 1: R8r R8si 3 C-LAN
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Configuration 2: R7r (+CMS) R7csi
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Configuration 3: R8si R8r Gateway
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Configuration 4: R8csi R8si Gatewa
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Configuration 5A: R8csi R8r (one C
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Configuration 5B: R8csi R8r (2 C-L
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4 Networking Example This chapter p
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Overview 4 Networking Example Task
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Network Map 4 Networking Example Ne
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Switch-Node 1 Administration 4 Netw
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Intuity Translations for DCS AUDIX
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A Screens Reference This appendix g
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Networking Screens A Screens Refere
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Page 289 and 290: Networking Screens A Screens Refere
Page 313 and 314: Other Networking-Related DEFINITY S
Page 331 and 332: B Private Networking This appendix
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Page 375 and 376: ISDN Feature Plus B Private Network
Page 381 and 382: QSIG B Private Networking QSIG Basi
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Page 387 and 388: QSIG B Private Networking QSIG CAS
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QSIG B Private Networking Setting U
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QSIG B Private Networking 10 Admini
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QSIG B Private Networking Call Comp
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QSIG B Private Networking Note: •
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QSIG B Private Networking QSIG Inte
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QSIG B Private Networking • Data-
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QSIG B Private Networking • Inter
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QSIG B Private Networking Called/Bu
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QSIG B Private Networking • QSIG
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QSIG B Private Networking • Atten
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QSIG B Private Networking • Confe
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QSIG B Private Networking • Exten
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Centralized Voice Mail Via Mode Cod
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Japan TTC Q931-a Private Networking
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C Security Issues This Appendix bri
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Network Security Issues C Security
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D Capacities and Performance This A
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D Capacities and Performance Perfor
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D Capacities and Performance Number
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E C-LAN Installation This chapter p
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E C-LAN Installation Install C-LAN
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F IP Trunk Installation and Adminis
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IP Trunk Administration F IP Trunk
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Procedures for Extension Dialing Be
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DCS over IP Trunk F IP Trunk Instal
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DCS over IP Trunk Making Calls to t
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Administration for Network Connecti
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G References This Appendix lists th
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G References Installation and maint
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G References CentreVu CMS The follo
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Glossary A AAR See Automatic Altern
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B8ZS Glossary B B8ZS See Bipolar 8
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Call Management System (CMS) Glossa
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COR Glossary COR See Class of Restr
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DID Glossary DID Direct Inward Dial
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facility Glossary F facility A tele
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interserver routing table Glossary
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link-access procedure on the D-chan
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NEMA Glossary NEMA National Electri
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PBX Glossary PBX Private Branch Exc
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outing plan Glossary routing plan R
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T-carrier Glossary T-carrier A hier
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virtual circuit (virtual connection
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Index A AAR and ARS features intera
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D Index Centralized Attendant Servi
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E Index E Distributed Communication
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L Index L ISDN Feature Plus feature
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R Index QSIG Call Transfer feature
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U Index U trunk access codes (TAC)
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