The TCV4270-5.0 from Prolink is a T1/PRI to VoIP gateway. It is designed to provide voice and data services over IP networks. It supports up to 4 T1/PRI ports, and up to 24 VoIP ports. It also supports voice and fax over IP, as well as universal IP signaling for the modern IP PBX. It uses FXS and FXO ports for connecting analog line cards, and supports H.323, SIP and MGCP protocols. The TCV4270-5.0 gateway includes features such as echo cancellation, VAD, QoS, and voicemail to email features. It is also compatible with popular VoIP service providers such as Skype, Google, and Gizmo.