While hearing a ringback, reorder, or busy tone, retrying the call is possible by pressing " ". System
programming selects whether pressing " " during a CO-to-CO line 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 signaling after the caller reaches the DISA line.
4.4 [2-3] 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 CO line, 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 CO-to-CO line
connection is made.
7.3 [5-3-1] Voice Message—DISA System—Option 1
→CO-CO with DISA—DISA to Public CO
→CO-CO with DISA—DISA to Private Network
The following three types of tone detection can be enabled for each trunk group to disconnect a CO-to-CO
line call via DISA.
–Silence Detection
→5.1 [3-1-1] Trunk Group—TRG Settings—Main— DISA Tone Detection—Silence
→[475] DISA Silence Detection
–Continuous Signal Detection
→5.1 [3-1-1] Trunk Group—TRG Settings—Main— DISA Tone Detection—Continuous
→[476] DISA Continuous Signal Detection
–Cyclic Signal Detection
→5.1 [3-1-1] Trunk Group—TRG Settings—Main— DISA Tone Detection—Cyclic
→[477] DISA Cyclic Signal Detection
•CO-to-CO Line 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 (® 3.1.15 CO Line Call Limitation). If the timer expires, the line will be
disconnected unless the originating caller extends the time by sending any DTMF signaling. The caller can
prolong the call duration within the preprogrammed time period and preprogrammed number of times.
4.4 [2-3] 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 CO-to-CO
line calls, to enable detection of the end of the call.
–When a CO line call is forwarded to another CO line
–When a CO line call is transferred to another CO line
–When a CO line call to an incoming call distribution group is answered by an outside destination
member
7.3 [5-3-1] Voice Message—DISA System—Option 1
→CO-CO with DISA—DISA to Public CO
→CO-CO with DISA—DISA to Private Network
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 CO line. For transferred calls or calls to an ICD Group, if the DISA port has become
unavailable when the CO-to-CO line conversation is actually established, the call is established without
DISA.
When using this feature, the CO-to-CO Line Call Limitation timer should be enabled. In addition, prolonging
the call through DTMF signaling is not available.
•DISA Call Transfer from Outside Destination
82 Feature Manual Document Version 2008-11
4.1.7 DISA (Direct Inward System Access)