Axiom is  a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
Polybutylene is simply a type of plumbing material that was manufactured between the late 70's and early 90's. It is thought that it was installed in over 6 million homes during that time period.
An IP PBX is a combination of a switch/router and a PBX that handles Voice over IP (VoIP): IPLAPBX PC PC PC PSTN Internet Internet To Main Office IP Phone IP Phone Fax IP Phone N LAN www.silicon-press.com Email: info@silicon-press.com Tel: 908-273-8919 Fax: 908-273-6149 Â© Silicon Press.n an IP PBX, computers can be on a shared LAN that is connected to the IP PBX. Telephones, on the other hand, should be directly connected to the IP PBX. This avoids Quality of Service (QoS) issues that arise if both computers and telephones are on a shared LAN.