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Avaya VTCPD Overview
P0602483 Ver: 03.41 Page 19
This document only deals with the Avaya VTCPD daemon process. For information
about application communication with TCP/IP hosts, refer to the Avaya Media
Processing Server Series Application Programming Reference Guide.
Connection Types
The Avaya VTCPD process provides a variety of connection types to support diverse
application requirements and host configurations. Avaya VTCPD can also be
configured to automatically switch to a secondary host, in the event of a primary host
failure.
The Avaya VTCPD daemon can run only one protocol at time. It can connect to
several hosts using the same protocol, but if other protocols are required, additional
Avaya VTCPD process must be started for each protocol.
Single Host Connection
The single host network is Avaya VTCPD basic configuration. The process connects
to a single host using the host name and TCP/IP port number (specified as arguments
on the command line). If a host name is not specified, Avaya VTCPD is configured as
a server, in which case it accepts connections on the specified port.
An application uses the SEND function (PeriProducer resource block) to send a
message to the host and it issues the RECEIVE function (PeriProducer resource
block) when it expects a response.
One Connection Per Line
Avaya VTCPD can create as many connections to a host as there are lines available. In
this type of configuration, each application has its own connection to the host. Avaya
VTCPD can also be started with the number of links equal to the number of phone
lines, without specifying host names and port numbers. This allows Avaya VTCPD to
open a connection for each new call, as needed.
Multiple Hosts
Multiple Avaya VTCPD daemons can connect to multiple hosts, each handling
different functions and protocols. Applications can switch the host sessions as needed.
Client and Server Modes
The Avaya VTCPD daemon is capable of running in both client and server modes. In
client mode, Avaya VTCPD connects to a host as a client process. In the server mode,
the Avaya VTCPD daemon accepts connections on the specified TCP/IP port. In a
multiple-host environment, for different hosts, the daemon supports both client and
server modes simultaneously.
- Release 6.0 1
- Table of contents 3
- Chapter 4 — VTCPD Messages 45 4
- Chapter 7 — Index 111 5
- Intended Audience 8
- How to Use This Manual 8
- Organization of This Manual 9
- VTCPD Features User Manual 10
- Trademark Conventions 11
- Avaya VTCPD Over 13
- Host Communications Overview 14
- Avaya VTCPD Overview 15
- MPS Software Architecture 16
- Avaya VTCPD Features 18
- Application-Defined Mode 20
- UDP Mode 20
- Avaya VTCPD Con 21
- Configuration 22
- The services File 22
- Avaya VTCPD Daemon Names 22
- Avaya VTCPD Port Assignments 22
- P0602483 Ver: 03.41 Page 23 23
- Variable Description 23
- Options Overview 24
- P0602483 Ver: 03.41 Page 25 25
- Connection Options 26
- Host Connection Options 26
- #: [port] 27
- Single Host Connection 28
- Multiple Hosts Connections 28
- One Connection Per Line 28
- Multiple Avaya VTCPD Daemons 28
- Channel Number 31
- Attaching to VMST 34
- Application-Host Options 36
- Monitoring Host Connections 38
- Backup LAN 38
- Time-Outs 39
- P0602483 Ver: 03.41 Page 41 41
- P0602483 Ver: 03.41 Page 43 43
- VTCPD Messages 45
- Message Format 46
- Message Identification (ID) 50
- Message Routing 53
- ISSUE-SEND-RECEIVE (ISR) 54
- Reserving a Slot 57
- Queuing Requests 57
- Clearing the Connection 58
- Changing Data Length 59
- Replies Routing 60
- Unidentified Host Data 62
- Administrative Line 64
- ISSUE-RECEIVE-SEND (IRS) 64
- Registering the ID 64
- Inverted Mode 64
- Application Connection Choice 66
- Choosing the Daemon 67
- VTCPD Application 71
- Programming 71
- Communicating With the Host 72
- VTCPD Application Programming 73
- Soliciting Host Data 73
- Host Driven Applications 76
- Sending Messages 84
- Variable Length Messages 86
- Receiving Messages 87
- Receiving Message Headers 88
- Specifying Which VTCPD 91
- Freeing the Host Connection 95
- VTCPD Message Timing 96
- Handling Resource Timeouts 97
- VTCPD Debugging 101
- Debugging 102
- Host Simulation 103
- Fault Tolerance 104
- VTCPD Troubleshooting 107
- Typical Problems 107
- Questions and Answers 109
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