Avaya Media Processing Server Series System (Software Release 2.1) Uživatelský manuál stáhnout pdf (Strana 234)

Avaya Media Processing Server Series System Reference Manual

Page 234 # P0602477 Ver: 3.1.11

Application-Host Interaction Configuration Options

The following discussion is an overview of the essential aspects of programming an

application for VTCPD communications from a configuration perspective. Typically,

PeriProducer applications are programmed to perform the following steps in the

indicated order using the functions of the Resource block:

• acquire the VTCPD resource (GET),

• send a message to the host (SEND),

• receive a reply from the host (RECEIVE),

• free the VTCPD resource (FREE).

This entails having VTCPD reserve an available host connection (the slot), send data

to the host (associating the ID field with the phone line), receive data from the host

based on the specified ID, and then release the slot.

After a successful attempt to acquire a VTCPD slot, the application receives the

condition gotres. Data associated with the condition contains the connection

number, slot number, and VTCPD port number in the format XXX:YYY:ZZZ. The

application does not need to process this data.

If a reply from the host arrives before the application issues the RECEIVE command,

the reply is held by the VTCPD daemon. If the application terminates, the slot is

released automatically.

Regardless of the message format, the SEND request should include only the

data portion of the message, because the delimiter (-f | -F d) or length header

(-f | -F l) is provided by VTCPD.

It is possible after the initial SEND request to mix SEND and RECEIVE requests in

any order. The message ID of the last SEND is always in effect (until the slot is freed)

and can be used to identify consecutive RECEIVEs.

For example, in the following scenario, the application receives two messages with

the specified ID-field:

• acquire the VTCPD resource,

• send a message to the host,

• receive a reply from the host,

• receive a second reply from the host,

• free the VTCPD resource.

During the interval between acquiring the resource (GET) and when the resource is

released (FREE or STOP), the slot is reserved exclusively for that application line.

If the size of the slot pool is limited, it may be necessary to reserve the slot for a

shorter period of time. If an application does not use GET (i.e., only executing SEND

and/or RECEIVE requests), the slot is released as soon as the host data arrives.

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Avaya Media Processing Server Series System (Software Release 2.1) Uživatelský manuál Strana 234