Is there an equipment through which I could make a conference call, combining a VOIP line and a land line?

Question by Mary Ann: Is there an equipment through which I could make a conference call, combining a VOIP line and a land line?
I want to make a three way call using a VOIP service and a land line at the same time. Let’s say, I have a Vonage account and a line land; I want to use the VOIP signal to commute the land line with another land line, Thanks in advance for your answers.

Best answer:

Answer by Randy
Try connecting the phone lines with 2 .01 microfarad capacitors . 1 in each wire to provide audio isolation & prevent dc shorts.

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