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PHONE LINE MANAGER 16 X 4
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9. Direct Outward Station Access (DOSA)
Direct Outward Station Access (DOSA) allows an incoming caller to enter a password and be connected to
a different outside line within the system and make an outgoing call. The original incoming call must be
directed to a CO line which is programmed to operate in the DISA mode (see Section 6.1).
After the system answers the incoming call in the DISA mode, the caller should dial a 6 or a 7, followed by
the 6-digit DOSA password. If the password entered matches the password stored in memory, a connection
will be made to the first available CO line listed in Outgoing Call Group #4 (see Section 8.2).
If the incoming caller entered a 6, the system must detect a DTMF digit within 35 seconds in order to allow
the connection to continue. If no digit is detected after 20 seconds, a beep tone will be heard. When a digit
is entered, the beep tone will cease. Thereafter, the beep tone will be heard every 4 minutes and a DTMF
digit must be entered within 15 seconds to continue the call. This will prevent the situation where the
incoming caller hangs up and the system is connected to the CO line indefinitely. In all cases, the call will
be terminated in 15 minutes or when a Clear Forwarding/Polarity Reversal signal is detected, if enabled.
If the incoming caller entered a 7 followed by the 6-digit password, the operation is exactly the same as for
a 6 except there will be no prompts for DTMF digits. This can facilitate FAX and data transfers via DOSA
since it would be impossible to enter a DTMF digit during data transmission. The 6 is still preferred for
voice conversations so that the CO line can be released in a short time after the conversation has ended.
If the outgoing CO line (to which DOSA is connected) is configured for pulse dialing, any digits entered
by the caller will also be output as pulses. This conversion of DTMF to pulses will continue until either a “*”
or “#” is entered. Thus the “*” or “#” are the preferred entry when responding to the disconnect warning
signal so that there will not be any pulses output on the CO line.
9.1 Enable Direct Outward Station Access (DOSA)
The DOSA function must be enabled by the System Manager to allow an incoming caller to enter a password
and be connected to a different CO line to make an outgoing call.
To Enable DOSA:
1. In the programming mode, enter 7834. Pause for confirmation tone.
To Disable DOSA:
1. In the programming mode, enter 7835. Pause for confirmation tone.
9.2 Entering the DOSA Password
The DOSA password must be specified using this command.
Enter Password:
1. In the programming mode, enter 764.
2. Enter a 6-digit password. Pause for confirmation tone.