My experience is that Ercan will always hand you over to Nicosia (they don't co-ordinate though) but Nicosia will not hand you over to Ercan if you fly in the other direction. Nicosia give you a freq for Ankara and if you call it they'll send you to Ercan anyway.
Landing lights on and a beady eye on TCAS is usually the order of the day whichever direction you transit Ercan FIR.