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Re: REQ: Circuit to join two phone lines for 3-way conversation

I am in the UK.

> > I have a Virgin Media/NTL landline and am considering installing a BT > landline too. (I need Caller ID but VM/NTL don't have it in my area). > > If I have answered a call on VM/NTL and also on BT then how can I join the > two lines to have a 3-way conversation? > > Is there a circuit I can build which will join the two lines? > > (1) Perhaps picking up the signals by a transformer across each of the two > line cords? > > (2) Perhaps across each curly lead which goes from handset to phone? > > (3) Would I get better results "audio-coupling" the handsets. Holding one > earpiece close to the other mouthpiece and vice versa?

I once had a two-line phone, with buttons for "line 1", "line 2", and "conference", which connected them together. But these were lines from the same telco's own switching station, so there would be no problem just clipping them together.

But if you're dealing with two different telcos, please call them first (maybe ask for a conference call ;-) ) and ask what they'd recommend.

Good Luck! Rich

Reply to
Rich Grise
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[snip]

: : I once had a two-line phone, with buttons for "line 1", : : "line 2", and "conference", which connected them : : together. But these were lines from the same telco's : : own switching station, so there would be no problem : : just clipping them together.

Erm.. well actually there would...

: : But if you're dealing with two different telcos, please : : call them first (maybe ask for a conference call ;-) ) : : and ask what they'd recommend.

I've used a BT Converse 2025 with a BT line on one port and a Sipgate VoIP line on the other and it worked fine.

I currently use a PBX which performs the same functions but the 2025 can be had very cheaply on eBay and is probably the OP's best bet (no I'm not selling one..!)

Ivor

Reply to
Ivor Jones

Ivor Jones explained :

I thought, perhaps incorrectly, you had actually had a problem when you had it connected this way - when both lines were plugged into the SPA all was well......

Reply to
Jono
[snip]

: : : I've used a BT Converse 2025 with a BT line on one : : : port and a Sipgate VoIP line on the other and it : : : worked fine. : : : : I thought, perhaps incorrectly, you had actually had a : : problem when you had it connected this way - when both : : lines were plugged into the SPA all was well......

Not that I recall. Although ISTR there was a bit of mains hum from somewhere.

Ivor

Reply to
Ivor Jones

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