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Many other phone systems like Asterisk is a complete IP PBX telecommunication system for UNIX and Linux systems that integrates with OpenPro business solutions.
Asterisk is a complete IP PBX in software. It runs on a wide variety of operating systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun Solaris, and provides all of the features you would expect from a PBX, including many advanced features that are often associated with high end (and high cost) proprietary PBXs. Asterisk supports Voice over IP in many protocols and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.
Asterisk is released as open source under the GNU General Public License (GPL), meaning that it is available for download free of charge. Asterisk is the most popular open source software available, with the Asterisk Community being the top influencer in VoIP.
OpenPro can integrate with many phone systems including trixbox, vontage, att and more.When a customer or vendor calls, Asterisk can ask for caller ID and pop up the information before you answer the phone. It will also log all the calls so that they can be recorded and added to the contact database. There is also an option available where the customer can input his or her contact ID to get verified by the system before the call goes through. OpenPro is the first to give you a complete package like this.
See the Asterisk glossary for a list of important terms.