Matrix Visionpro System Manual page 167

To make a DOSA call, minimum two trunk lines are used (L2 and L3 as shown in the figure below). Hence, these
should be connected to the PBX. However, in the entire process four trunk lines are (L1, L2, L3 and L4 as shown in
the figure below) used while using this facility.
L1
Residence
When a caller dials a DOSA activated trunk, two trunk lines (L1 and L2) are used. Then the caller grabs the third
trunk (L3) and dials the desired phone number where fourth line (L4) is used.
In DOSA calls, speech quality may deteriorate as the length of the path increases.
• DOSA facility can be enabled on one or more trunks.
• DOSA can be enabled/disabled for Day and Night modes independently.
• Because of poor line conditions, it is possible that DOSA facility may not work.
• Abbreviated Dialing is allowed through DOSA.
How to configure
Enable/disable DOSA on trunk/s during Day time and Night time using command 3601 and 3602.
1.
Assign a CoS group with DOSA enabled to a station to which DOSA call is to be allowed.
2.
Set DOSA Inactivity Timer using command 3020. Refer
3.
Set DOSA Warn Timer using command 3021. Refer
4.
DOSA Timers
• DOSA Inactivity Timer: It signifies the time after which the system gives warning beeps to the caller. For
this time duration a line remains active even after the call is finished if the caller forgets to log out by dialing
'#0'. Hence it is advisable to configure this timer for optimum period.
• DOSA Warn Timer: It signifies the time after which the system disconnects the call.
161
PSTN
L2
(DOSA Activated
Trunk)
VISIONPRO at Office
L3
"DOSA Timers"
"DOSA Timers"
Client's Place
below.
below.
Matrix VISIONPRO System Manual