The terms "IP telephony" and "voice over IP" (VoIP) are synonymous. However, the term VoIP is widely used for the actual services offered (see VoIP for details), while IP telephony often refers to ...

The primary IP telephony signaling protocols are H.323, SIP and MGCP/MEGACO. There are also proprietary protocols; for example, Cisco's Skinny is widely used. See IP telephony. THIS DEFINITION IS ...

Using external microphone and speakers, the D22 supports bidirectional audio, records lip-synchronized sound and sends alarms to the user via integrated SIP-based IP telephony functions. It is powered ...

Attackers are currently attacking devices from Mitel and Zyxel. There is currently no security update for affected Zyxel ...