IP Telephony and Voice over IP (VoIP) is the basic building block of Unified Communications and Collaboration. It enables secure, reliable voice calls over your network. IP telephony transmits voice communications over the network using open, standards-based Internet Protocol. It provides a way for you to extend consistent voice communications services to all your employees in their workspaces — on the main campus, at branch offices, remote, or mobile.

Cisco IP telephony solutions are an integral part of Cisco Unified Communications, which unify voice, video, data, and mobile applications on fixed and mobile networks.  Using your network as the platform, your organization can gain the inherent benefits of a converged network for transport and interconnection. IP telephony makes it easier to:

    • Provide highly secure, reliable, scalable communications that take advantage of your LAN and WAN
    • Improve employee flexibility and productivity with the full range of Cisco Unified Communications and third-party applications
    • Take advantage of a wide range of Session Initiation Protocol (SIP)-based capabilities

With a converged network over IP, the concept of unified communications becomes a reality. IP promises lower costs, easier management, remote monitoring and con­trol, higher bandwidth calls enabling higher-quality audio and video, and integration into the corporate information technology mainstream.

With unified communications, separate communication tools are integrated into one system so that they can be used together transparently. Unified communications combines applications and services—such as video, telephony, calendaring, Instant Messaging, presence, and web collaboration—with any type of communications device and multiple networks for connectivity anywhere, anytime.