The f_sleep(0.5) to delay the registration of the PC for the 2nd SCCP connection sometimes fired too late and we received the VGCS/VBS Assignment Request before the channel ConnHdlr was registered in RAN_Emulation. Then in turn we need to delay call establishment until the channel is ready. Implement proper synchronization points to make sure the order of registers is accomplished while making sure the 2 ConnHdlrs are registered before they need it.
