A PABX phone system, or Private Automatic Branch Exchange, is a telephone system switching device functioning within a company or corporation. It is capable of automatically sending incoming calls to specific extensions following pre-defined rules. PABX systems are used to handle internal and external telephone calls for a business. They offer services such as call transfers, voicemail, and even conference calls. In a large corporate office, a PABX system can support numerous outgoing and incoming calls, guaranteeing proper communication. For example, it can send external calls from customers to the proper departments and let the employees make external calls from an accessible collection of lines, in addition to providing advanced call-handling services and management features that support enhanced productivity and customer care