How do I connect telephones for VoIP service on the BGW320-500?
Connect one end of a phone cable to the RJ14 jack labeled 'Phone' on your BGW320-500. For one line, directly attach it to the telephone device. To support two lines simultaneously, apply an Inner-Out Pair Splitter Adapter before splitting and plugging into each handset individually (Page 19).
From the official Humax Bgw320 500 Broadband Gateway manual, page 19
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