(b)Cost sharing arrangement. A cost sharing arrangement is an arrangement by which controlled participants share the costs and risks of developing cost shared intangibles in proportion to their RAB shares. An arrangement is a CSA if and only if the requirements of paragraphs (b)(1) through (4) of this section are met.
Asterisk is a complete PBX in software. It runs on Linux, BSD, Windows (emulated) and OS X and provides all of the features you would expect from a PBX and more. Asterisk does voice over IP in four protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.
The asterisk (*) is at the point where drainage occurs from the maxillary sinus into the nose through part of the ostiomeatal unit. The maxillary sinus ostia is bounded below by the uncinate process (U) and above by the lower bony portion of the ethmoid sinuses (E).