Thanks much for the help.
Just wondering - does this sound possible :
Make sp1 GV, sp2 the phone SIP, a VG for CC, and then create a trunk group (sp1,vg1) for the IP phone to hunt for a line off of.
Probably should do as you recommend and save myself some grief though.
EDIT -
Got everything working - two handsets working in parallel hunt group, GV, and CC. All is well.