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Lucent Technologies DEFINITY Enterprise Communications Server Release 5, CallVisor, ASAI Protocol Reference Instructions Manual
Lucent Technologies DEFINITY Enterprise Communications Server Release 5, CallVisor, ASAI Protocol Reference Instructions Manual
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Contents Issue 6 June 1997xxi World-Class Routing (ARS/AAR), Incoming Call Routed over Outgoing ISDN Trunk Group, Charge Information Provided during the Call B-169 n22. Miscellaneous Cases B-170 Unsuccessful Requests for Domain (Station) Control B-170 ISDN Network Congestion B-172 Invalid Call Destination— Reorder B-173 User Does Not Go Off-hook B-174 Extension Removed B-174 Invalid Association Requests B-175 Invalid Call_id Numbers B-176 Invalid Station Numbers B-177 IN Index IN-1
Issue 6 June 1997xxvii About This Document This manual provides detailed protocol information for the CallVisor® Adjunct/Switch Application Interface for DEFINITY® Enterprise Communications Server Release 5. (In the interest of brevity, CallVisor ASAI is referred to as ASAI throughout the remainder of this manual.) Reason for Reissue This document has been updated with new features up to Release 5.5. Terminology See the glossary included in the DEFINITY Enterprise Communications Server CallVisor ASAI Technical Reference . Intended Audience This document is written for the library or driver programmer of an adjunct computer who is responsible for creating the library of commands for use by the applications programmer. However, this document will also be helpful to any individual who needs a protocol description of the ASAI. ASAI provides its users with the capability to drive a variety of ECS features. It is essential, therefore, that readers of this document possess extensive knowledge of ECS features and their interactions in addition to ASAI functionality.
About This Document xxviiiIssue 6 June 1997 NOTE: See Related Documents that follows for a list of documents that provide information on ECS features and ASAI functionality. Related Documents Adjunct/Switch Application Interface (ASAI) Specification, 555-025-203 The ASAI Specification document provides a detailed description of the ASAI Reference Model. The Reference Model contains all the capabilities available with ASAI. DEFINITY Communications System CallVisor ASAI Planning Guide, 555-230-222 This manual provides planning and implementation information for CallVisor ASAI. DEFINITY Enterprise Communications Server Release 5 CallVisor ASAI Technical Reference , 555-230-220 The Technical Reference is the “companion book” to the Protocol Reference. It provides a detailed functional description of CallVisor ASAI for Release 5. DEFINITY Enterprise Communications Server Release 5 CallVisor ASAI Overview, 555-230-225 The Overview provides a general description of CallVisor Adjunct Switch Application Interface (ASAI) and applications. This document also describes the functions and services that can be provided using this interface. DEFINITY Enterprise Communications Server Installation, Administration, and Maintenance of CallVisor ASAI over the DEFINITY LAN Gateway , 555-230-223 This document describes the installation, administration, and maintenance of the ASAI-Ethernet application, which provides ASAI functionality using 10Base-T Ethernet rather than BRI as a transport media. DEFINITY Enterprise Communications Server Release 5 CallVisor PC ASAI Installation and Reference , 555-230-227 This document provides details on the installation, administration, programming, testing, troubleshooting and engineering of the CallVisor PC. DEFINITY Enterprise Communications Server Release 5 Administration and Feature Descriptions , 555-230-522
Related Documents Issue 6 June 1997 xxix The Administration and Feature Descriptions document serves as an overall reference for the planning, operation, and administration of Release 5 for DEFINITY ECS. DEFINITY Enterprise Communications Server Release 5 Implementation, 555-230-302 This manual documents the implementation of the DEFINITY ECS. ISDN Basic Rate Interface (BRI) Specification, 801-802-100 This technical reference provides detailed information about the physical interface structure and message-oriented signaling procedures of the ISDN Basic Rate Interface (BRI). CallVisor ASAI CD Document Set, 585-246-801 This CD ROM contains four CallVisor ASAI release 5 documents. It includes CallVisor ASAI Technical reference, CallVisor ASAI Protocol Reference, CallVisor ASAI Overview, and CallVisor ASAI PC.
Issue 6 June 19971-1 1 Introduction to Layer 3 Protocol This chapter introduces the layer 3 protocol by explaining how the ISDN messages, Facility Information Elements (FIEs), and Information Elements (IEs) work together to implement ASAI. Message sequences and detailed encoding information are provided.
Introduction to Layer 3 Protocol 1-2Issue 6 June 1997 ASAI Association An ASAI association is an exchange of one or more messages on the Integrated Services Digital Network Basic Rate Interface (ISDN BRI) signaling channel (D-channel) or on an Ethernet interface between the ECS and the adjunct. To start an association, the initiating endpoint assigns an idle ISDN Call Reference Value (CRV) and places it into an initiating message that is sent to the serving endpoint. When the serving endpoint accepts this message, the association is initiated and the endpoints may exchange an unlimited number of intermediate messages. To close the association, one endpoint sends a terminating message that frees the CRV for later use. The three ISDN messages and their functions used to control an association are as follows: nA Q.931 REGister message initiates an ASAI association. nA Q.931 FACility message is the intermediate message. nA Q.931 RELease COMplete message ends an ASAI association. While the ISDN message controls the association, the Q.932 Facility Information Element (FIE) within these messages carries the ASAI information across the interface. The Facility Information Element (FIE) provides the framework to invoke an ASAI capability and pass parameters associated with the capability. In addition to the REGister, FACility, and RELease COMplete messages that provide ASAI application level functions across an interface, the ECS uses three other ISDN messages: 1. Management Information Messages (MIMs) (for link maintenance and management) 2. RESTart 3. RESTart ACKnowledge These messages are discussed in greater detail in Chapter 4, ‘‘Information Elements’’.
ISDN Call Reference Values (CRVs) Issue 6 June 1997 1-3 ISDN Call Reference Values (CRVs) ASAI endpoints use ISDN Call Reference Values (CRVs) to associate the sequence of messages carried on an ASAI association. CRVs map one-to-one to ASAI associations and each CRV carries information for only one ASAI association, regardless of how many capabilities are invoked during the association. CRVs are unique on an ASAI link and are present in every ASAI message sent across the interface. The originating ASAI endpoint assigns an idle CRV for the ASAI association (one not in use for any other ASAI association) and sends the CRV in a REGister message to initiate the association. After the CRV is accepted, and while both endpoints exchange intermediate messages, the CRV contained in each message remains fixed for the duration of the association. When either endpoint passes that CRV in a RELease COMplete message, the association ends. The CRV becomes idle and the originating endpoint may assign the CRV to a later association. Use of a flag bit in the CRV encoding ensures that the two connected ASAI endpoints do not allocate the same CRV on an ASAI. 1 The link administration requirements for an ASAI specify that the length of the CRV value be set to one or two bytes. The ECS uses CRVs for the following types of ASAI associations: nCall Control When an adjunct has control of a call, it may invoke several Call Control capabilities. All call control invocations, together with call feedback, occur on one CRV for any given call. nDomain (Station) Control When an adjunct controls calls for a specific station extension, Domain (Station) Control capabilities are invoked. Like Call Control, all domain control invocations, together with call feedback, occur on one CRV for any given call. Domain (ACD Split) Control is a subset of domain control and allows the adjunct to obtain agent-related information for agents in the specified ACD split. 2 nNotification When an adjunct requests notification of certain events on a given CRV, the messages containing the event reports all use that CRV. 1. Since CRVs are local to an ASAI, endpoints on different interfaces may allocate the same CRVs on their respective interfaces. 2. In the formal ASAI model in 555-025-203, Domain (Station) Call Control and Domain (ACD Split) Control are subsets of Call Control, but for the purpose of this manual, they are discussed as separate capability groups.
Introduction to Layer 3 Protocol 1-4Issue 6 June 1997 nRouting When the ECS requests routing information for a call using a given CRV, the adjunct returns the route on that same CRV. nRequest Features The request and response for the ECS feature invocation use the same CRV. nValue Queries The request and response for queries use the same CRV. nSet Value Both the request and response for the Set Value capability use the same CRV. nAudits The adjunct may request an audit operation over a CRV. The ECS uses the same CRV and responds with several messages containing audit information. When all the information has been sent, the ECS terminates the association.