PABX is stand for Private Automated Branch Exchange, also call as keyphone system in malaysia market. The PABX keyphone system is the telephone network previously widely used by call centers and other large organizations. Currently the PABX keyhpone system is allows a single access number to offer multiple lines to outside callers while providing a range of external lines to internal callers or staff for small organization. The PABX key telephone with the extra buttons and the intelligence to allow incoming calls to be transferred to other extensions.
Now the PABX keyphone already support Voice over Internet protocol and public branch exchange systems -- VoIP and PBX, respectively -- are two ways of achieving the same end goal: to make and receive phone calls. Traditional PBX systems have been around for years and are primarily used by businesses that need a dedicated phone network. VoIP is a recent development that uses the Internet to make calls. When you are deciding between the two, consider the advantages and disadvantages of both options, most of which are largely dependent on your situation and your end goal.