How do I connect a phone handset to use my NBN phone service?
If your NBN service includes a phone service, plug a compatible handset into the grey UNI-V1 port on your NBN Connection Box. If UNI-V1 does not work, try the UNI-V2 port instead. (Page 2)
From the official TP Link Vx420 G2v manual, page 2
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