Avaya Configuring Frame Relay Services Bedienungsanleitung PDF herunterladen (Seite 43)

Frame Relay Overview

117376-C Rev. 00

2-13

Message Processing

Table 2-4 shows how the router software handles various types of message

exchanges.

Table 2-4. Message Processing

Message Type Message Processing

Call setup When the software receives a setup message, it performs several

validations before it can deliver the message to the called

subscriber and return a call proceeding message to the calling

subscriber.

The software must verify that all of the information fields in the

message are in the proper order, all of the mandatory elements are

present, and that all elements contain appropriate values.

Call proceeding After the network determines that the setup message is valid and

contains all the appropriate information, it returns a call proceeding

message to the calling subscriber.

When the network delivers the setup message to the called

subscriber, the called subscriber may then return a call proceeding

message to the network.

Connect When the called subscriber accepts a call, it sends a connect

message back to the network. The network validates the message

and checks any negotiable parameters. If the message passes this

inspection, the network passes the message back to the calling

subscriber.

Disconnect When a subscriber wants to terminate a call, it sends a disconnect

message to the network. The network validates the messages and

passes it to the peer subscriber.

The cause information element is mandatory in the disconnect

message. Under normal conditions, it contains a value of 16,

“Normal Call Clearing.”

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Avaya Configuring Frame Relay Services Bedienungsanleitung Seite 43