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 PBX with Internet Protocol connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack.he features of an IP PBX are similar to the features of a normal PBX but are typically enhanced with features taking advantage of Internet / intranet connectivity, such as: 1  Unified communications / unified messaging. 2  Voicemail transcription (speech to text). 3  Find me/follow me.