Getting three old classic phones working with VoIP via GPO boxs or similar.

[infobleep]

I live in the UK and have three old rotatry phones, which I wish to get working with VoIP. I've read some posts on here but not found an answer to my possible solution. Not that I know if it will work.

My analogue phone collection, for which I have shared photos, consists of the

Siemens W28.Na.v210W28, which dates from around 1943 and has a glass ringer.

GPO 711 L. 664/1, from the 1960s

GPO 746 PLA68/1, from the early 1970s from memory. This has the letters around it so I understand it is an early model from the 746 range.

The W28 still has the original phone connector ends. the 746 has the original GPO box and the 711, has been cut short.

Would it be possible to connect the W28 to a box similar to the GPO one used by the 746 and then connect that to another device that interfaces with my VoIP.

With the 711, that would just get a modern end as it's been chopped up so fine.

Would my idea work with the Grandstream HT802 Analog Telephone Adapter? My broadband provider is YouFibre and they provbide the VoIP.

[ka1axy]

Sounds like the major hurdle will be the connection. If the phones are basically compatible with modern POTS lines, I see no reason why they shouldn't work with the HT802.

Maybe make a small breadboard with a terminal strip and run a RJ11 connectorised cable from that to the Grandstream, then connect the phone cables to the terminal strip?

The HT802 will accept 10pps dial pulses though you may need to enable them in the admin "web" interface. I can't think of a reason not to try this. Test first with a 500 set or a buttset, then connect the more exotic set.

[infobleep]

Sounds like the major hurdle will be the connection. If the phones are basically compatible with modern POTS lines, I see no reason why they shouldn't work with the HT802.

Maybe make a small breadboard with a terminal strip and run a RJ11 connectorised cable from that to the Grandstream, then connect the phone cables to the terminal strip?

The HT802 will accept 10pps dial pulses though you may need to enable them in the admin "web" interface. I can't think of a reason not to try this. Test first with a 500 set or a buttset, then connect the more exotic set.

Thanks for the reply. I don't know if the phones are compatiable with modern POTS lines but I would expect the GPO ones to be at least.

If I do a search would I be able to find step by step instructions on making terminal strips?

How difficult is it to build these? I am not that practical when it comes to stuff like this. I would likely be doing this myself.

I doubt it would be something one could buy?

I do wish to get these working.

[dsk]

My W28 works on Linksys pap2, but the ringer load is much higher than more modern phones. A 0.5 uf capacitor or a 500-700 ohm resistor in series with the ringer may be smart if you want to have other ringers on the same line.http://www.fernsprecher.de/museum/schaltplan.htm

[dsk]

The best result on the W28 did Iget by adding a 680 ohm resistor in series with the ringer (Arrow1) and a 220 ohms at arrow 2 made better sound quality.

[infobleep]

Thanks for the replies. Very helpful.

I am meeting some friends in July, who did electrical engineering degrees and would undeestand this stuff better than I would so I will go through my idea and your replies with them.

[ka1axy]

https://www.amazon.com/Telephone-Straight-Extension-Connector-Landline/dp/B07W4V9Q1Q

Phone cable to connect between terminal strip (below) and HT802

https://www.amazon.com/dp/B09VSWRQ6

Barrier type terminal strip. Phone cable above connects between top terminals and HT802, bottom terminals are where the wires from your phone connect.

You only need the Red and Green wires from the RJ11 cord, and those connect to the L1 (a) and L2 (b) wires from your phones. That should get you started. For trying different combinations, a set of jumper leads with alligator (crocodile) clips might be handy. See below.

https://www.amazon.com/Alligator-Silicone-Insulators-Electrical-Testing/dp/B0971DBWDW