BT Telephone Splitter Adapter Socket Plug Extender Fax Modem

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Buy BT Telephone Socket Line 4 Way Splitter | Female Jacks to BS6312 431A Male Plug | Cable UK Adapter Landline Port Converter Extender FAX Modem

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can someone please explain this set up? : r/HomeNetworking

Telephone & Broadband Adapters & Connectors — LoopsDirect

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2pcs Telephone Splitter 2 Way Double Phone Socket Adaptor RJ11 BT Plug Male to 2 Female