Yep, if you order a PPV online it is not receiver/room specific and plays on all of them at once for the same charge; and since you did it online there is no need for the phone line connection and the billing automatically goes through to DirecTV.
If you remote order without the phone line, as stated above you will fill up the PPV slots on the card until full and then will be "turned off" from any further ordering and once the line is re-connected you will get a huge bill at one time, once that bill is paid you will be "turned on".