Installation guide

AP-IP120 IP Phone Installation Guide Version 1.0
AddPac Technology Proprietary & Documentation
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Connecting PSTN Line (FXO-Optional)
This PSTN port is used for connecting PSTN Central Office line in case of a network failure. The user
may connect the PSTN cable to the PSTN port in order to implement PSTN backup. As shown in the
figure below, connect the PSTN cable
. ( available in AP-IP120E).
(Figure 3-3) Connecting PSTN