Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador descarregar pdf (Página 50)

VTCPD Features User Manual

Page 50 P0602483 Ver: 03.41

VTCPD Features User Manual

Message Identification (ID)

VTCPD uses a Message ID to associate received messages with application requests.

Requests sent to the host from an application and the response to the application are

identified as corresponding to each other because they use the same Message ID.

Message IDs are not used when there is only one connection per line, because in this

configuration, the line identifies the source and destination of the message.

Messages are identified by unique combination of N consecutive bytes, starting from

the M -byte position of the message. This is called the Message ID. Unless a host

connection is exclusively reserved for a phone line (see below), all messages must

include message ID.

VTCPD uses one of the following methods to assign the Message ID:

If the Message ID is assigned by applications, they are responsible for assuring that no

two outstanding requests have the same ID. The daemon doesn't check the context of

the ID field. It only matches it byte for byte with the ID in host responses. If two

requests with the same ID are pending at the same time, the results will be

unpredictable.

If host data contains a Message ID that cannot be associated with any phone line, the

data is discarded. However, it is possible to pre-assign an administrative phone line

that receives all unidentified messages. The messages are sent to the line as the data

portion of the condition unexdata.

Message ID

Bytes Message ID Example

one Binary phone line number of the application sending the request

-I 2

two Binary phone line number and MPS number of the requesting

application.

-I 2:1

three ASCII phone line number of the requesting application in the

format 999.

-I 201

six

ASCII phone line and MPS number of the requesting

application.

-I 6:24

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 113 114

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Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador Página 50