3 way light switch question

[Blackbird]

Can I use a standard 3 way light switch in the basement and a insteon light switch upstairs to control the same lights?  Or do both have to be insteon?

 

Thanks

[mwester]

Both have to be Insteon.

[Banichi]

Wherever the switch-leg from the fixture goes to is what becomes the "master" switchlinc for a scene that is your 3-way circuit. The "slave" switchlinc only needs hot, ground, and neutral connected and then you link the two switchlincs into your scene in the ISY. 

[apostolakisl]

Both need to be Insteon.  If you left the other as a regular 3 way switch, when you switch it "off", that will literally turn the Insteon switch off . . . as in no power to it all, not just the light off, but the entire switch goes dead.  Of course you can leave one of the 3way switches and keep it in on at all times.  I have one spot that I did this where the other switch is in a place where God only knows why my architect put a switch there.

[Blackbird]

Thanks