Document: LT0732 QE20 Fibre Networking User Manual
Issue 1.0 24 May 2023 Page 2-11
10. The two parties talk to each other.
11. The operator at Panel A disconnects the call by pressing the WIP call button
again.
12. Panel A transmits the call-on-hold condition to the remote panel via the PIB
and networking.
13. Panel A terminates the VoIP call.
Note: if the call is terminated by the remote party hanging up their WIP phone, refer
to the final steps of the next sequence.
2.1.3 WIP Call Initiated by Field WIP
When a field WIP is picked up, the following happens in sequence (assuming the call
is answered at a remote QE20): –
1. A field WIP is picked up. The QE20 (panel or amprack) this WIP connects to
is hereafter referred to as panel A.
2. Panel A maps the field WIP to its local button and sets this flashing.
3. Panel A transmits the WIP button to the other QE20 panels (via the PIB and
IP networking).
4. The other QE20s map panel A’s WIP button to their WIP buttons, and if the
calling WIP button maps to a local WIP button rings the master WIP and
flashes the appropriate WIP LED.
5. The operator at the QE20 panel answers the WIP call by pressing the
flashing call button. This panel is hereafter referred to as panel B.
6. Panel B sets this WIP button to the connected condition.
7. Panel B then transmits the “connected” condition for the WIP button to panel
A via the PIB and fibre networking.
8. Panel A maps this WIP button to its local WIP button and sets it to the
connected condition, along with the field WIP.
9. Panel B instructs its VIF module to dial the phone number configured to
reach panel A.
10. The ATA at panel B uses its configured dial plans (and most likely speed-
dial) settings to find the IP address of the ATA at panel A.
11. The ATA at panel B makes a VoIP call to the ATA at panel A.
12. The VIF at panel A sees the incoming ringing and answers the VoIP call.
13. The ATAs at panel A and panel B transmit digitised audio between each
other (both ways) so the two parties can talk to each other.
14. The WIP connected to Panel A is hung up.
15. Panel A transmits the WIP button idle condition to panel B (via the PIB and
IP networking).
16. Panel B receives the idle condition for the WIP button, extinguishes the WIP
LED, and terminates the VoIP call.
17. The ATAs hang up.
Note: if the call is terminated by a user at the QE20, refer to the final steps of the
previous sequence.
2.1.4 WIP All-Call
This works in a similar way to Speech – refer above. When a remote QE20 receives
an All-Call from another QE20 and it is configured to accept this All Call, it will
instruct its VIF module to ring the phone number configured for All Call at the calling
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