"Dan Luke" wrote in message
...

??
The TRACON issued the squawk code and takeoff instructions
which were relayed by the VFR tower. That doesn't count as
establishing comm?


Well, no, it doesn't count as establishing two-way radio communications, but
it doesn't have to. Recall the first sentence of FAR 91.130(a); "Unless
otherwise authorized by ATC, each aircraft operation in Class C airspace
must be conducted in compliance with this section and §91.129." If the
Class D tower relays a heading and beacon code from the Class C facility,
you are otherwise authorized.