QE20 Fibre Networking User Manual Document: LT0732
Page 2-10 24 May 2023 Issue 1.0
2. Panel A transmits which zones are selected for speech to the other QE20
panels via the PIB.
3. Each other QE20 maps panel A’s zones to its own zones, and if any do map
to local zones, it waits for the PTT signal to become active, then instructs its
VIF module to dial the phone number configured to reach panel A.
4. The ATA uses the dialled phone number and its configured dial plan to
determine the IP address and UDP port number for the VoIP proxy (PIB) or
ATA at panel A.
5. The ATA at each such panel makes the call to the VoIP proxy or ATA at
panel A.
6. On receiving the first incoming call the VoIP proxy then calls the ATA at
panel A.
7. The ATA at panel A signals the VIF it has an incoming call by ringing, and
the VIF answers the VoIP call.
8. The ATA at panel A transmits digitised audio to (1) the VoIP proxy which will
then distribute this to each of the ATAs at the other panels that have joined
the same call or (2) the ATA at the other panel.
9. The operator makes the speech announcements to the occupants of the
zones selected.
10. The operator at Panel A releases the PTT button or deselects zones for
speech.
11. This is transmitted across the data network to the other QE20 panels.
12. The other panels see that speech is no longer required for their zones and
so terminate their call to the ATA or VoIP proxy at panel A, which will then
terminate the call it made to the ATA at panel A once all remote nodes have
disconnected.
WIP Audio Communication
2.1.2 WIP Call initiated by User Interface
When a WIP call to a field WIP at a remote panel is initiated on a QE20, the following
happens in sequence: –
1. The operator at the QE20 initiates the call by pressing the WIP call button.
This panel is hereafter referred to as panel A.
2. Panel A transmits the pressed WIP button number to the other QE20 panels
(via the PIB and fibre networking).
3. The other QE20s determine if the button maps to one of its WIP buttons and,
if so, sets the button to the ring state. If that button maps to a field WIP then
the WIP module rings that WIP circuit.
4. When the field WIP is answered (off-hook), the remote panel informs Panel
A of the fact via the data network.
5. Panel A sees the called WIP is off-hook and instructs its VIF module to dial
the phone number configured to reach the remote panel.
6. The ATA at Panel A uses its configured dial plans (and most likely speed-
dial) settings to find the IP address of the ATA at the remote panel.
7. The ATA at Panel A makes a VoIP call to the ATA at the remote panel.
8. The ATA at the remote panel signals the incoming call by ringing the VIF,
which answers the call.
9. The ATAs at panel A and the remote panel transmit digitised audio between
each other (both ways) using RTP.
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