The Wiki of Unify contains information on clients and devices, communications systems and unified communications. - Unify GmbH & Co. KG is a Trademark Licensee of Siemens AG.
VoIP = Voice over IP.
VoIP (or IP Telephony, Internet Telephony, DSL Telephony) is a often used term for the technology that use the Internet Protocol to exchange voice and other communication services. So far this services mainly have been carried over the public switched telephone network (PSTN).