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8.4 EIS System Operation
8.4.1 WIP Calling ECP
The following is the procedure when initiating a call from a WIP to the ECP:
1. Remove the handset from the cradle at the WIP. This will cause the appropriate WIP select
indicator to flash at all ECP's and the WIP call buzzer to sound at all ECP's.
2. A confidence tone can be heard at the WIP.
3. The ECP which responds to the call is referred to as the controlling ECP. The call is answered
at the ECP by removing the handset from the cradle and pressing the WIP select switch which
corresponds to that WIP. A full duplex connection between the two parties is then established.
8.4.2 Conference Call
If a second WIP initiates a call, the select indicator for that WIP will flash and if the WIP select switch
corresponding to the second WIP is pressed, the select indicator for that WIP will go steady, and a
conference call between the three parties is set up. Up to 5 WIP's can be supported in this fashion. If
a sixth WIP calls the ECP, the select switch of the sixth WIP is pressed, nothing will happen, i.e. the
select indicator will remain flashing. The only way that the sixth WIP can be answered is if one of the
5 WIP's involved in the conference call is cancelled the sixth WIP can then take its place.
8.4.3 Completing the Call by the WIP
If the WIP handset is placed back onto its cradle after the call is connected. The handset at the
controlling ECP will go silent and the WIP select indicator will switch off, completing the call.
8.4.4 Completing the Call by the ECP
The call can be completed at the ECP in two ways. By replacing the handset on the cradle OR by
pressing the WIP select switch. In either case the WIP will return to the confidence tone. To be able
to call or be calls again the WIP handset should be returned to its cradle.
8.4.5 ECP Calling WIP
The following is the procedure when initiating a call from the ECP to a WIP:
1. The confidence tone can be heard in the handset at the controlling ECP.
2. The WIP select switch corresponding to the WIP to be called is pressed, which causes the WIP
select indicator at the ECP's to flash, and the buzzer to sound at the WIP. Up to 5 WIP's can
be called using this procedure.
3. Once the handset is picked up at the WIP the connection is established and the WIP select
indicator becomes steady.
4. When the ECP is calling more than one WIP, the status of the calls, i.e. WIP answering is
reflected in the WIP select indicators.
8.4.6 ECP To All WIPS (ALL CALL)
The following is the procedure when initiating an All CALL from the ECP to all WIP's:
1. The confidence tone can be heard in the handset at the controlling ECP.
2. The All Call button is pressed; this causes all WIP select indicators at the ECP to flash.
3. The WIP's, buzzers sound, with a 3 second or longer ON time and 3 second OFF time. This
allows the warden at the WIP to distinguish between a direct call to his WIP and an All Call
type call.
MAN1813-9
14
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