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DIPs talk to TSM scripts through interprocess communication (IPC) messages queues provided by the Resource Manager. IPC message queues are similar to mailboxes behind the registration desk in a hotel.
The voice system acts as the hotel, the guests correspond to the DIPs, and the attendant at the desk is TSM. The DIPs have their own separate mailboxes (messages queues) for receiving messages sent by other guests or outsiders.
Data is passed between DIPs and TSM scripts through these mailboxes. DIPs leave messages to TSM scripts in TSM's predefined mailbox. TSM then reads, sorts, and distributes these messages to the appropriate script, just as the attendant distributes messages left for guests at the front desk of the hotel.
The voice system has a total number of 213 message queues (mailboxes) available, numbered from 1 through 213. These numbers, known as message queue keys (Qkeys), serve to uniquely identify individual message queues.
The voice system Qkeys are divided into the following groups:
