The popular Asterisk iPBX server is the reigning champion of the Voice over Internet Protocol (VoIP) set, but there are other worthy contenders as well, such as SipX. If Asterisk represents the first generation of software PBXes, SipX is second generation, with a different approach and design philosophy.
This second-generation iPBX is a SIP proxy that delivers a raft of PBX functions like, voice mail,...