Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Bedienungsanleitung PDF herunterladen (Seite 89)

VTCPD Application Programming

P0602483 Ver: 03.41 Page 89

Host Responses From Any Connection

The host response normally arrives through the connection the application used to

send the request. VTCPD can also be configured to route host responses from any

connection (vtcpd -md) (see Message Routing on page 53.)

If VTCPD is configured to route host responses from any connection, internal

message processing is delayed slightly.

Asynchronous Replies and Reply Notification

Normally, if the host message is not available when an application executes a

Resource block to receive a message, the application pauses (blocks). However,

VTCPD can be configured for asynchronous data delivery (vtcpd -m a) (see

Asynchronous Replies and Reply Notification on page 89.)

If VTCPD is configured for asynchronous data delivery and the application has not

already executed the Resource block to receive the message, VTCPD sends the

message to the application as condition data associated with unexdata. The

application can retrieve the data from the System.ConditionData data card.

VTCPD can also be configured to notify the application when the host sends a

message (vtcpd -m n). When the host message arrives, VTCPD notifies the

application by generating unexdata. In this configuration, when the application

receives unexdata it should execute a Resource block to receive the message.

Retrieving Unidentified Host Data

Normally, if the host data contains a message ID that VTCPD cannot associate with a

phone line, VTCPD discards the message. However, VTCPD can be configured to

route all unidentified host data to a particular phone line that is running an

administrative application (vtcpd -a#) (see Unidentified Host Data on page 62.)

In this configuration, VTCPD sends the unidentified messages to the administrative

line as condition data associated with unexdata. The application can retrieve the

data from the System.ConditionData data card.

There are several important considerations for an administrative application designed

to retrieve unidentified host messages:

• VTCPD sends these message asynchronously. To avoid possible race conditions,

the administrative application should not execute any blocks that pause the

execution of the application.

• In most circumstances, the administrative application should not restart. If the

application restarts, it can lose messages that arrive during the transition period.

However, to properly reconnect to VMST, the application must restart if it

receives linkdown.

The following demonstrates the implementation of an administrative application:

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Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Bedienungsanleitung Seite 89