SIP & VoIP

Hi All,
 
Has anyone looked into testing SIP/VoIP devices? (handsets, gateways,
etc)
 
I haven't seen it mentioned yet, and it's something I will need to
consider in the not too distant future (as I'm sure many others will
too)!
 
I expect to get a call about it one day, so I am hoping Hobbit will have
a place monitoring this too.
 
-Gerard Lill