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I've just purchased a Grandstream HT801 for one of my old analogue phones, it used to powered from the BT phone line, I've connected via an RJ11 cable directly from the phone to the Grandstream and I get no dial tone, I can't even test the connection!
Further research suggests I need a BT plug (plus ring capacitor) to RJ11 adapter?!
So then I tried one of my DECT phones which is independently powered, and the ran the RJ11 cable from the base station to the RJ11 socket on the Grandstream and still "nothing" (I can't do any test calls or echo recording checks)
I've set this up with the correct settings, according to voipfone support they can see I'm plugged in and see my Grandstream is registered with their system - but I can't carry out any test calls to the service on either phone.
Everyone on here, Amazon and elsewhere seem to rave about it's plug in and go but I can't get it to work at all, when others have had hassle free setup - any advice or help would be appreciated - I'm totally at a loss.
EE 4G >> Plus Net >> Uno Fibre+.>> Sky Fibre >> VOXI 4G>>Swish Fibre Home 400 (402/410)
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There is no standard pin configuration usage for an RJ11 plug. Of the 6 pins some devices use pins 2 and 5 and some use 3 and 4. I would suggest trying with a cable where pins 2 and 5 at one end are connected to pins 3 and 4 at the other.
Michael Chare
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How would that change how the phone works, does that mean it will ring? I think I've tried every combination of UK RJ11 I have in the house, I just don't why it isn't even performing test calls.
These are phones that were both working on the normal PSTN network (using the BT plug) but when I use an RJ11 to RJ11 it doesn't work, what have I done wrong?
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What specific handsets are you plugging into the ATA?
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Here are some pictures:
Phone Album Retry
There a bit dusty and dirty - apologies, these phones both worked on the old phone line before FTTP was installed and I had the copper disconnected.
EDIT: Edited the link as album wasn't shared
EE 4G >> Plus Net >> Uno Fibre+.>> Sky Fibre >> VOXI 4G>>Swish Fibre Home 400 (402/410)
Edited by juzzy25 (Wed 24-Nov-21 22:28:50)
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Sorry none of your links work for me...
When you login to the Grandstream Web UI - navigate to Device Configuration and then the Staus tab.
Where it says Port Status for FXS - do you see the entry there toggle from 'On Hook' to 'Off hook' when you take the phone physically off hook to make a call?
Yoiu are connecting with a straight-through RJ11 (4-wire) lead from the ATA to the handset?
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The "2m RJ11 To RJ11 Cable Lead 4 Pin Telephone Phone 6P4C CROSS OVER BLACK" for £1.80 shown in this link might work. You would have to buy it and try if none of your phones work. If you have an old cable you could cut it in half and then join it so that the pairs are crossed.
Michael Chare
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Really only need the two centre pins to be present and cross-over.
If OP holds up each RJ11 plug side by side, very quick and easy to see if the colours transpose at either plug.
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Sorry none of your links work for me...
When you login to the Grandstream Web UI - navigate to Device Configuration and then the Staus tab.
Where it says Port Status for FXS - do you see the entry there toggle from 'On Hook' to 'Off hook' when you take the phone physically off hook to make a call?
You are connecting with a straight-through RJ11 (4-wire) lead from the ATA to the handset?
Apologies - gallery was set to private, I've changed it now.
On every single RJ11 I have in the house - every single time it stays as "on hook"
As described below I'm using a 4-way RJ11 cable
I have three RJ11s:
1 x two centre pins
1 x two outer pins
1 x all four pins
Both phones have RJ11 contacts on pin 1 and pin 4, at this point I'm ruling out the phones and it's a cable issue then?
Really only need the two centre pins to be present and cross-over.
If OP holds up each RJ11 plug side by side, very quick and easy to see if the colours transpose at either plug.
I've ordered a BT plug to RJ11 adapter to see if this does the job for me, I don't want to be buying any more RJ11 cables that may not work, since I already have three.
I think I've exhausted all the options for now, let's see what happens when the plugs turn up next week.
EE 4G >> Plus Net >> Uno Fibre+.>> Sky Fibre >> VOXI 4G>>Swish Fibre Home 400 (402/410)
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The reason why your phones aren't working is because they are wired with pins 2 & 5 on the RJ11 whilst the FXS port on the ATA needs connection on the two centre pins 3 &4 (on a 6 way connector)
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Really only need the two centre pins to be present and cross-over.
If OP holds up each RJ11 plug side by side, very quick and easy to see if the colours transpose at either plug. Not necessarily, reversing pins 3 and 4 may well not make any difference. I even have a BT phone which has a switch on the bottom which does just that so that some indicator light works.
The OP's phone quite possibly comes with a cable with and RJ11 on one end and a BT 431A plug on the other. The phone might use pins 3 and 4 or 2 and 5. So long as the cable is compatible it won't matter.
Michael Chare
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Thanks to both of you!
I put all the cables in front of me.
Two of them was an old VDSL2 modem cable - 2 centre pins (no crossover)
One of them was pins 2,3,4,5 - run straight through (no crossover)
....then I rechecked the cable with the BT plug at the end and each cable crossed over.
I ordered the cable you recommended me and that should turn up Monday, these are very old phones so maybe that's the issue, at least I know what's going on now.
EE 4G >> Plus Net >> Uno Fibre+.>> Sky Fibre >> VOXI 4G>>Swish Fibre Home 400 (402/410)
Edited by juzzy25 (Wed 24-Nov-21 23:14:26)
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As per post above, now that the gallery photos work, its quite clear the OP's phone have pins 2 & 5 wired in the RJ11 - his FXS port will be wired for the centre pins 3 & 4.
So OP needs a double crossover cable RJ11 male to RJ11 male wired 2->3, 3->2, 4->5, 5->4
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Well good luck. I hope I am right. I have had the same problem with other equipment.
Michael Chare
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Where do I get that cable from then?
It's a tough one to Google. 
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So what are 2 and 3 on one end connected to on the other end?
Michael Chare
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The 'A' end and the 'B' end of the cable are reversible.
Basically the OP as I think I understand it, has handsets which use position 2 and 5 on the RJ11 (the outside pins). The FXS port on the ATA would typically use positions 3 and 4 (the centre pins).
Therefore ti get a connection, we need to get position 2 on the handset port to position 3 on the FXS port and likewise postion 5 on the handset port to position 4 on the FXS port.
The unused pin/pairs aren't needed but as said allow the cable to be reversed/plugged in either way.
Its easier if you draw a picture/trace out the pinout.
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Like this:
https://postimg.cc/1fcw5Jkb
Admittedly much faster/easier with a bag of RJ11 plugs and a crimp tool in the toolbag to make your own leads up.
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That is what I think but I don't think the product description on the web site is much good as one could read it as 2 and 3 on one end going to 3 and 2 on the other end, and 4 and 5 going to 5 and 4.
Michael Chare
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That’s how I read the pin out from the leads-direct website. They’re good folks there, I have bought a lot of custom power leads from them in the past. They would have it back if it doesn’t work (to be honest postage to/from would be more than the worth of the lead).
I have a stash of RJ plugs and my trusty registered jack crimp tool just for this sort of stuff, admittedly it’s not had an outing lately. Sometimes easier to make up your own leads sometimes than go hunting for them.
The other thing to do would be to use an ‘US to UK’ adapter lead - which has the centre pins on the RJ11 plug going to pins 2 & 5 on a BT socket. Then just use a straight-through BT plug to RJ11 lead to the handset.
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Thanks to you both!
My first BT adapter turned up early this morning and I talked to the seller who made the changes you recommended, after some initial setting changes on the ATA, I now have a dial tone and I can dial out also.
My incoming number isn't active yet but I can now use my very old phones! Thanks!
EE 4G >> Plus Net >> Uno Fibre+.>> Sky Fibre >> VOXI 4G>>Swish Fibre Home 400 (402/410)
Edited by juzzy25 (Fri 26-Nov-21 10:32:51)
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Good stuff. Glad you’re sorted. 👍
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I am having trouble too - I am currently waiting for Openreach to install my fibre connection.
I have an HT801 connected to a BT Converse 2200 phone - using a 431a phone doubler socket to link and rj11 - 431a straight through to a 431a - rj11 2x3 and 4x5 cable so effectively the same cable you mention.
I can call out to test the phone, can receive calls but, the phone does not ring! The HT801 web interface says it is ringing but the phone is silent - I can answer the call all is great but what is wrong with my cable to stop it ringing? I can make up a cable and happy to do so. The end position will be when fibre is installed and BT phone line disconnected I want to plug an rj11 to 431a cable into a socket on my internal phone lines and be able to use my phones/alarm system dialer!
Any ideas how I can wire this up correctly? I cannot find out how the HT801 FXS port is wired to resolve it!
Thank you in advance for you help
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My gues is that a BT Converse 2200 phone needs three connections rather than the more modern two. This is because the "ring capacitor" is located in the expected BT Master Socket rather than in the phone (as is done with 2-wire phones.
If hardwiring, fit a Master Socket, alternatively a RJ11 to BT431A adapter, but one with a built in capacitor for this very purpose.
However, be aware that some RJ11 to BT431A adapters which although sold with a capacitor, have not had one fitted. Caused me a fair bit of confusion when setting up my VOIP.
An eBay https://www.ebay.co.uk/itm/393179648610?hash=item5b8... looks promising, but I cannot guarantee that there is actually a capacitor fitted.
Cheers!
Clive
Andrews & Arnold Home::1 FTTC DrayTek Vigor 2762ac Cisco ATA191 for A&A VoIP together with a HUAWEI E5776 with O2 Data SIM
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Marvellous so when I disconnect the BT landline the capacitor in the master socket will allow my phone to ring when the HT801 is patched into the extension socket? Must have an old master type socket lying around somewhere to test!
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Yes, should do. If you connect the two centre wires from the RJ11 plug that is in the ATA to 2 & 5 of ether the Master Socket or Slave socket, or even the two terminals A&B that the BT line went into on the Master socket (assuming an NTE type). Whichever is easiest.
Cheers!
Clive
Andrews & Arnold Home::1 FTTC DrayTek Vigor 2762ac Cisco ATA191 for A&A VoIP together with a HUAWEI E5776 with O2 Data SIM
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Many thanks, BT master socket wired with a cable with RJ11 on the end - pins 4-3 connected to A and B plugged into the HT801, phone plugged into the socket and hey presto a working VoIP system! All ready for BT to install fibre and keep the alarm working!
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keep the alarm working! Didn't think people still used diallers for their alarms, very 1980's
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If you have a cable adaptor without the necessary ringing capacitor a lash up solution is to plug one of the old adsl filters that everyone has in a drawer somewhere between the cable adapter and the phone. I guess the adsl filters must have a ringing capacitor in them.
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All now working - Alarm was installed in the year 2013. In the event of fire, break in or panic alarm, the dialler rings three different numbers in order to acknowledge the call while the alarm is sounding. Seems quite alright to me - don't want to splash out on upgrading!
Just one issue now is that the Foreign Electromotive Forces Test has a Fail!
Test Verdict: FAIL
AC Vrg = 3, Vtg = 0, Vtr = 0
DC Vrg = -8028mV, Vtg = 394mV, Vtr = 8422mV
All other tests pass so not sure what the issue is here.
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