Availability: RJ11 to BT Adaptors with a Ring Capacitor for FXS can be found from various retailers or telecommunications suppliers in the United Kingdom. It is important to ensure that the specific adapter you choose is compatible with the device and network requirements. Whilst the router uses VOIP to provide the phone service this is all internal to the Vodafone network. "normal" BT phones are required. Despite advice from a useless webchat agent, a VOIP phone is not needed (and apparently will not even work). Ring Capacitor: The adapter is equipped with a ring capacitor, which is important for ensuring proper ring signal transmission. It helps stabilize the ring voltage and frequency, ensuring that the connected device receives the appropriate ring signal.

The tech2 experts again know what a working system should look like and seem to have access to more internal information that they can change. However, I think their main expertise is broadband and they seem to struggle with voice issues. There is a member of their team who is the voice expert which they eventually decided to consult and it seems this voice expert managed to fix things. For the phone service to work, the "phone" light on the router needs to be lit (solid white). Until this is lit then any fiddling around with changing phones or cables is a waste of time (this didn't prevent some of the Vodafone experts suggesting this!). Insist on Vodafone getting this phone light lit as it is their problem until this is working. RJ11 Connector: The adapter features an RJ11 female connector that allows you to plug in devices with RJ11 male connectors. RJ11 connectors are commonly used for telephony and networking applications.

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My situation was that I upgraded from an ADSL service to a FTTP (fibre to the house) service. Openreach installed a new access point on the wall into which I plugged my existing router (A wifi hub - THG3000). There was some debate as to whether FTTP needed a new router but my existing one is fine. Apparently THG3000 with a -G suffix can be problematic. Once the phone service is working then the web management interface (192.168.1.1) shows connections to the phone from the "Overview" tab. Once the phone is working there is a dial tone and any calls made to the number cause the phone to ring (as you would expect!). It seems 2 phones can be plugged in (TEL1 and TEL2) and when receiving a call both phones will ring. After many hours of speaking with Vodafone "experts" I now have a working system so thought it might be worthwhile to others to set down what I've learnt.

The people on 08080 034 515 seem to be more competent and sound like they know what a working system should look like. Their approach to fixing things is generally just "turn it off and turn it on again" (with slight variations such as resetting the router, etc.). If the turning off and on doesn't fix it for you then you'll need to get escalated to "tech2" experts.