Direct Outward System Access (Dosa) - Matrix Visionpro System Manual

Direct Outward System Access (DOSA)

DOSA enables a user to use the system resources for making outgoing call from a remote location. This facility is
generally used to make long distance calls.
This feature allows access to system resources to remote users, and therefore has serious implications for
your system's security. Protect your system from unauthorized access and misuse. It is recommended to
protect this facility with a unique password.
How it works
• A call lands on a DOSA enabled trunk. System answers the call after DOSA/DID Answer Wait Timer.
• System greets the caller or plays music to the caller for the time equal to DOSA\DID Music Timer.
• The system plays Dial Tone for time equal to the Dial Tone Timer. The system waits for the caller to dial 1-
Station Number-User Password (the caller should dial this in Tone mode (DTMF) only).
• The system checks if the station number and the password are correctly dialed.
• If the number and/or the password is not proper, the system plays Error Tone for the time equal to the
Error Tone Timer. Otherwise, if voice guidance is enabled on the trunk, the system plays the Voice
Guidance for Wrong Dial message. The system waits for correct station number and password and
expects the caller to repeat above steps again.
• If time-out occurs, the system transfers the call to the landing destination of the trunk and further call
processing is terminated.
• If the caller logs in successfully, the system plays the DOSA Dial Tone (short beeps) for the time equal to
the DOSA Beeps Timer. The system waits for the caller to grab a trunk during these beeps by dialing the
Trunk Access Codes or codes for Abbreviated dialing (800-899).
• The system allots the trunk to the caller (provided it is free) and waits for the caller to dial the external
number.
• At this stage, either of the following two possibilities may arise,
• The Called Party is free: The caller gets RBT. Speech is established when the called party answers. If
the called party does not answer the call then the call gets disconnected after time = DOSA Inactivity
Timer + DOSA Warn Timer. If the caller needs to continue the call, he/she must dial any digit.
• The Called Party is busy: Hence, the caller gets Busy Tone. Caller should dial '#0' to disconnect (it is
equivalent to ON-Hook command in DOSA mode). Caller gets DOSA Dial Tone. The caller may retry by
grabbing a trunk and dialing out the same or different number again. Else to log out of the DOSA
session, the caller must dial '#0'.
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