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Looking for some technical advice.
We have a monitored alarm system that rings a control room and challenges intruders via a speaker microphone set up. It was wired into the BT wall box.
We’ve now gone full fibre and it no longer works. The alarm company want £200 to upgrade, I think they said we need to convert to VOIP. Is this something I can do myself? Can’t I just put a phone plug on the existing alarm wire and plug it into the phone socket on the router?Enyaq EV
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@Jojoe Hi, yes it is something that you can do yourself. On my phone it was just a matter of removing the phone socket cable from your router and unpluging the other end from your BT master socket.
Providing that you have a “Dect phone” you then plug that cable into the back of your router.
If in doubt, contact your ISP who should offer assistance with is.
Joss
Current car: BMW X2 sDrive 20i M Sport 5dr Step Auto In metallic Portimão Blue. 04:10:2025
Previous car:Peugeot 308 GT Premium 1.2 Pure tech Petrol.As @joss has said, just plug the phone socket into the router, which will be via Voice Over Internet Protocol.
Two drawbacks
1 If the internet goes down, so does VOIP
2 In the event of a power cut, you will loose VOIP, as you would with a DECT phone. You can opt for a UPS back up supply cheap enough or DIY if you wish,
Cheers Joss, Kezo.
If I take the alarm hard wired cable out of the old BT wall box, I’ll need to attach a BT plug, I’m sure that cable only has two wires, any ideas where those two wires will go when I fix them into a BT plug, I’m sure a BT plug has 4 wires.
Cheers
Enyaq EV
@Jojoe did you ring your ISP tech support for help on this? Also have you gone FTTP Fibre To The Premises.?
If you have gone FTTP then maybe you need to connect the Alarm to the ONS fibre box. So again call your installer of your fibre for advice.
Joss
Current car: BMW X2 sDrive 20i M Sport 5dr Step Auto In metallic Portimão Blue. 04:10:2025
Previous car:Peugeot 308 GT Premium 1.2 Pure tech Petrol.Originally those 2 wires of the alarms auto dialer would have connected to a BT socket terminals 2 & 5. Terminals 2 & 5 correspond to the BT cable that comes into the house connected to line A & B at the rear of the socket.
If you had a older system, you will find terminal 3 was also connected when you pull the the front of the socket off. Terminal 3 is the bell wire for the telephone.
Moving foward as @joss say do you have FTTP and who with? However if you have an FTTP, the small ONT box will likely have a TEL 1 terminal, where you can connect you alarms auto dialer to. You will however need an RJ11 plug to do so.
Are the two wires a red and green twisted pair comming from your alarm?
Yes we have full fibre to the house, they put a new box on the wall that has lights on it. I’ve got some RJ11 plugs and a crimping tool. I’m with Vodafone, when Openreach came the guy said he couldn’t do it.
Enyaq EV
I vaguely remember speaking with you before about yhis or something very similar?
Your alarm voice dialer will be analogue and worked of your old PTSN line. By the sounds of it for £200 your alarm company is trying to sell you a new voice dialer but, there is no need!
Thereare couple of ways of going about this and its based around Voice re-Injection (VRI), if you want to look it up!
You can modify a BT NDE5C master socket or buy a VSI facplate however, you need to disconnect the incomming wiring from the stree from the socket, as it’ll likely still have 50v on it.
or you can buy something like this.
https://www.run-it-direct.co.uk/adsl-vdsl-faceplates/voip-voice-injection-kit/
Kezo, they’ve left the old BT box with the alarm wire in place, it’s identical to the one on the link you sent. If I buy that kit is it just a matter of plugging it into the phone socket on the modem then into the old wall box, if so that’s brilliant cheers. 👍
Enyaq EV
Kezo, they’ve left the old BT box with the alarm wire in place, it’s identical to the one on the link you sent. If I buy that kit is it just a matter of plugging it into the phone socket on the modem then into the old wall box, if so that’s brilliant cheers.
Yes it plugs into one of the phone sockets on the router/modem, You then remove the existing BT faceplate and replace it with the modified one in the kit (I would disconect & tape BT’s incoming wires incase it still has 50vdc on them)
If your confident you can modify your existing BT socket if you wish and just but a RJ11 to BT socket lead (or make your own), as it would work out cheaper. Let me know 🙂
@Jojoe did youb get that kit?
Better than I can explain if anyone wants to modify there existing MK4 socket
@Kezo, not bought it yet, but planning to. I read that link you just posted but it was a bit complicated for me. 👍
Enyaq EV
@Kezo, I’ve got a cable to go from the router to the BT wall socket but it didn’t work. I opened the BT wall box and discovered the Openreach engineer disconnected the alarm. I’ve now got to figure out which of the two alarm wires go where. There are 2 cables 1 blue and 1 white and the sockets to behind the BT faceplate has 3 hole numbered 5, 3 and 2. Do you know what colours go where?
Enyaq EV
Scrub the last I figured it out, I used 2 and 5 pot luck and it worked, turns out 3 was blanked out anyway so I couldn’t go wrong, just hope I’ve put the right colour in the right socket. The monitoring station answered the intercom when I triggered the alarm so I’m assuming all is good.
Cheers @Kezo @Joss You saved me £190.
@kezo I didn’t even buy that kit, I just bought an RJ11 to BT cable on eBay for £5 to plug from my router to the old BT socket. I was under the impression the signal needed to be digitised and I’d need a special digital phone.🍻 🍻
Enyaq EV
@kezo I didn’t even buy that kit, I just bought an RJ11 to BT cable on eBay for £5 to plug from my router to the old BT socket. I was under the impression the signal needed to be digitised and I’d need a special digital phone.
Glad you sorted it!
The Tel port on the router gives the same 48-50v and there’s no wizzardry involves however, not knowing much about Vodaphones router, I played safe but, the kit is more for if your existing bt socket were removed on fibre installation and with the modification shown in the link basically gives you, what you got now. The only digital is DECT insise BT’s fibre router.
Originally those 2 wires of the alarms auto dialer would have connected to a BT socket terminals 2 & 5. Terminals 2 & 5 correspond to the BT cable that comes into the house connected to line A & B at the rear of the socket. If you had a older system, you will find terminal 3 was also connected when you pull the the front of the socket off. Terminal 3 is the bell wire for the telephone.
PS ^^
You should tell the alarm company you sorted it for a fiver 😂
Originally those 2 wires of the alarms auto dialer would have connected to a BT socket terminals 2 & 5. Terminals 2 & 5 correspond to the BT cable that comes into the house connected to line A & B at the rear of the socket. If you had a older system, you will find terminal 3 was also connected when you pull the the front of the socket off. Terminal 3 is the bell wire for the telephone.
PS ^^ You should tell the alarm company you sorted it for a fiver 😂
Yes and maybe ask them exactly they were going to do for £190.
Im on a role today, I changed the batteries in Mrs Joes stairlift. That probably saved me £80. Two 12v 7amp batteries from Screwfix for £55. Only took 10 minutes, though this is the 4th time I’ve done them.
Enyaq EV
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