PABX & IP Phone
PBX stands for Private Branch Exchange, which is a private telephone network used within a company or organization. The users of the PBX phone system can communicate within their company or organization and the outside world, using different communication channels like Voice over IP, ISDN or analog. Short for Private Automated Branch Exchange, this telephone network is commonly used by call centers and other organizations. PABX allows a single access number to offer multiple lines to outside callers while providing a range of external lines to internal callers or staff. A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet, instead of the traditional public switched telephone network (PSTN).