IP PBX, also known as unified communications or business telephone system, a telephone call center internal switching system. PBX systems can handle the communication between sites, and effective management. PBX is called the Private Branch eXchange (private branch exchange), which is a more old-fashioned terms, the fact that the system in the last century has been remarkable development. The traditional PBX system is composed of two key factors: the routes and stops. Line, also known as a relay, is connected by the telephone company to the public switched telephone network (PSTN) hub. Constitute only a phone or similar fax machines, modems, and credit card terminals and other equipment site.

PBX initial mission is to share limited resources. It is different from single singlet, a business can enjoy all site resources within the LAN. Automatically connect incoming calls by the processor, and then automatically transfer the appropriate person or department. When internal staff need to make a call, the processor will select an available line to connect. These early systems are often referred to simply as “telephone exchange.”

Over time, the management processor line gradually being replaced by electromechanical and electronic systems after. The original system add additional functionality to optimize the inbound route, so the call can be transmitted efficiently between sites, and also in accordance with the provisions of the access or reject the call. Some systems also increased, such as voice mail, call queuing and other value-added services.

Today, the company’s phone system is no longer just a simple converter. Such as auto-attendant, voice messaging, call waiting and conferencing and other assistive technology has become the standard configuration. Basic analog and proprietary digital phones have been replaced by standard IP phones. Now, customers can communicate via SIP trunk or other forms of VoIP services on the Internet with the outside.

At the beginning of the development of PBX systems, electronic communication is available only on a wired telephone. Today, the field of communications has expanded to include e-mail, instant messaging, video conferencing, desktop sharing, text messaging and mobile phones. Unified Communications is a catch-all term, it represents the integration of all these technologies and business process integration process. UC purpose is to improve efficiency, while simplifying management.

asterCC IP PBX features

asterCC commercial version is IP-based communications system, with its own rich PBX (telephone exchange) function, the system supports the use of natural SIP protocol network relay (SIP Trunk), or by increasing the voice gateway cards, asterCC with enterprise legacy seamless phone system, or used to replace traditional telephone switches. asterCC support fully automated installation using an automated installation CD and ordinary computer servers, about 20 minutes you can get a feature-rich phone system, and can be upgraded at any time according to need to call center functionality. Compared with other systems, use asterCC as a business phone system, you can get:

  • VoIP features: VoIP world is shifting from the traditional PSTN lines. SIP is the current standard of VoIP, asterCC supports IP extensions (phones) and IP Relay (services).
  • Voicemail: In the past, voicemail is an optional additional features. Today, the feature is PBX system is a competitive flag. asterCC commercial version of the system provides voice mail functionality.
  • message can be sent as an attachment to a specified e-mail
  • In the browser directly listening
  • Support MWI voice mail notification when an IP phone supports MWI, the phone will show the number of voice mail
  • Thanks to ASR, voicemail email can give your text of the message
  • Mobility: asterCC outside support and carry the extension call function, for out of office, travel, employees can also be directly through the extension call.
  • No limit the number of accounts and extensions
    • Only 10 agents purchased license, you can get unlimited technical support PBX features and year
  • Support multiple trunking
    • Can use low-cost, easy to set the IP trunk, also using traditional PSTN trunk
  • Multi-system network
    • Multiple astercc can seamlessly for multi-branch enterprise communications networking
  • Extension supports multiple clients
    • Use the old phone line, you can save the investment for the new extension extension can enjoy the convenience brought by new technologies
  • Reports and billing
    • Easy to understand the business and data communications costs
  • Outbound route
    • Automatically selects the most appropriate outbound trunk, save telco bill
  • Outbound group
    • Different departments can set different permissions for outbound
  • Inbound route
    • Different times different numbers, the call to the most appropriate place
  • IVR voice menu
    • create professional corporate image
  • Conference calls
    • Support multi party calls
    • Web GUI for conference calls management

A typical enterprise IP PBX phone system topology as follows:

  • E1 trunk for external calls(VoIP for international calls)
  • IP phones for internal


PBX function list please refer to  asterCC wiki