Huawei’s unified communication gateways offer rich IP-PBX telephony and conferencing capabilities for up to 20,000 users and support for analog equipment in hybrid environments. U1900 Series Gateways provide upstream connections to the Public Switched Telephone Networks (PSTNs) or to voice switches in private networks. Downstream support for IP phones, analog phones, and soft terminals brings effective communication and collaboration to every user. Intelligent routing, whitelist/blacklist features, instant messaging, and carrier-grade reliability deliver high-quality IP-based voice and communications services for enterprises at low TCO.