How does the IP phone connected to the AR router work properly

When the AR1220V, AR1220W, or AR1220VW connects to an IP phone and the IP phone has no external power supply, the IP phone must be connected to the FE4, FE5, FE6, or FE7 interface on the SRU and the AR router must be connected to an external power supply. When other models are connected to IP phones, IP phones must be connected to external power supplies.

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