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While hearing a ringback, reorder, or busy tone, retrying the call is possible by pressing " ". System
programming selects whether pressing " " during a trunk-to-trunk conversation returns to the DISA top
menu or sends a DTMF tone.
•
DISA Mute Time
It is possible to set the Mute time until the outgoing message (OGM) plays and the PBX starts to receive
the DTMF signalling after the caller reaches the DISA line.
→
10.3 PBX Configuration—[2-3] System—Timers & Counters—DISA / Door / Reminder / U. Conf—DISA
—Mute & OGM Start Timer after answering
•
End of Call Detection
If a call through DISA is routed to a trunk, DISA can be used to detect the end of the call. This function
can be disabled through system programming. If disabled, DISA is released when the trunk-to-trunk
connection is made.
The following three types of tone detection can be enabled for each trunk group to disconnect a trunk-to-
trunk call via DISA.
–
Silence Detection
→
11.1.1 PBX Configuration—[3-1-1] Group—Trunk Group—TRG Settings—Tone Detection—DISA
Tone Detection—Silence
–
Continuous Signal Detection
→
11.1.1 PBX Configuration—[3-1-1] Group—Trunk Group—TRG Settings—Tone Detection—DISA
Tone Detection—Continuous
–
Cyclic Signal Detection
→
11.1.1 PBX Configuration—[3-1-1] Group—Trunk Group—TRG Settings—Tone Detection—DISA
Tone Detection—Cyclic
•
Trunk-to-Trunk Call Duration Limitation
For a call between two outside parties, even if end of call detection cannot be performed, the call can be
disconnected by a system timer. (→ 2.11.8 Trunk Call Limitation) If the timer expires, the line will be
disconnected unless the originating caller extends the time by sending any DTMF signalling. The caller
can prolong the call duration within the preprogrammed time period and preprogrammed number of times.
10.3 PBX Configuration—[2-3] System—Timers & Counters—DISA / Door / Reminder / U. Conf
→
DISA—CO-to-CO Call Prolong Counter
→
DISA—CO-to-CO Call Prolong Time
•
Automatic DISA Activation
DISA can be set through system programming to automatically activate for the following types of trunk-to-
trunk call, to enable detection of the end of the call.
–
When a trunk call is forwarded to another trunk
–
When a trunk call is transferred to another trunk
–
When a trunk call to an incoming call distribution group is answered by an outside destination member
Before the call is made, the PBX confirms that a DISA port is available. If no DISA ports are available, the
call is not routed to a trunk. For transferred calls or calls to an ICD Group, if the DISA port has become
unavailable when the trunk-to-trunk conversation is actually established, the call is established without
DISA.
When using this feature, the Trunk-to-Trunk Call Limitation timer should be enabled. In addition,
prolonging the call through DTMF signalling is not available.
•
DISA Call Transfer from Outside Destination
An outside party such as a cellular phone can transfer a trunk call to an extension (including TIE) or an
outside party by pressing "#" + extension number (including TIE) or an outside party's number, if DISA is
connected by the Automatic DISA Activation feature. This feature can be enabled or disabled through
2.16.1 Direct Inward System Access (DISA)
Feature Manual
171
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