[VoIP] 4-Wire Telephones?

[Steph Kerman]

Rusty Dekema wrote:
> So, my grandmother's house aside, was the PSTN ever a 4-wire system?
Never
> I really thought it was, but I could definitely be mistaken.
I guess so...
> If 4-wire phones were used on the PSTN at one point, about when was this practice discontinued?
>   
The PSTN once was at one time a 1-wire system and your grandmother's in 
particular might well have been.  But never ever 4-wire.

Steph
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