The script and call progression

This section describes how the system processes a call using a TSM script.

1. The system accepts a call from the central office or switch on a telephony card.
2. The telephony card then signals the T1 interface process (TWIP), that it has accepted the call.
3. TWIP signals the AD process that it has accepted the call.
4. AD checks a service table to determine the service and process required for the call. In this example, TSM is the selected process.
5. TSM reads the script instructions and allows the script to control the sequence of events during a call.
6. AD takes control when the call has ended.

The following sections describe call progression with a script in greater detail.

Starting conditions

Before the script takes control, the following sequence of conditions must be met:

• A caller dials and reaches the incoming telephone facility for the system.
• The software recognizes the ringing condition.
• AD checks an internal table to determine the script to run for the call.
• All script memory is set to zero and the time-outs are set to their default values.

Script control

When all the starting conditions are met, the script takes control and typically executes the following functions during the call:

• Answer the incoming line (takes it off hook).
• Send recorded voice messages to the caller.
• Listen to touch-tone signals.
• Obtain information from the host or from the disk.
• Send information to a host or a local database.
• Record transaction events on disk.
• Take action when a caller does not respond.
• Signal a termination condition to TSM.

TSM control

TSM terminates an active script if one of the following conditions exists:

• The script executes a quit instruction.
• The maintenance software provides commands to seize control of equipment at any time, thereby terminating transactions on one or more channels without notice.
• A program error causes a script to terminate, such as when a goto or quit is missing after the last instruction.

Script termination

When the script ends, TSM performs the following functions:

• Put the telephone line on hook if the script did not disconnect.
• Stop voice play.
• Discard any pending messages from the host.
• Send the CDH a message about the transaction and a copy of the event memory.
• Release the channel to AD so it is available for the next call.

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