that may indeed work. but a key point to remember here is that the caller must be using gtalk2voip and issue the call command from a chat session. you can cannot divert calls made in the standard IM to IM fashion.
it may be more reliable for callers to use
number@gtalk2voip.com. that is how i recieve calls and have never had any issues. the call would be made the same way
call number@gtalk2voip.com(i think
call user_at_domain@gtalk2voip.com will also work in the same way). agian the caller would have to be a gtalk2voip member.
on the other hand if they called by using
call number@voxalot.com the call would go straight through without trying to reach you a MSN first(therefore delaying the call by 20 seconds)