In the US you'd follow standard 'lost coms procedure' WRT to altitudes and routes; unless on a 'RADAR required' procedure or vectoring is expected
in that case you follow the written lost com procedures for the airspace
The reason you are still issued clearance limits in RADAR airspace, is the basic goal is to arrive at your clearance limit at the flight plan time or hold at an intermediate area until such time as you may proceed to your clearance limit and then you may proceed with any available approach....that's IFR procedure,
it's not an emergency by the way only an annoyance ATC knows all about you,..hence the flight plan
Last edited by Pugilistic Animus; 11th March 2009 at 19:00.