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Voice over Internet Protocol (VoIP), also called IP Telephony, is rapidly becoming a familiar term and technology that is invading enterprise, education and government organizations. This white paper provides an introduction to VoIP technology, testing and its operation. Voice over IP (VoIP) brings a new environment to the network technician that requires expanded knowledge and tools to deploy and troubleshoot IP phones. In a VoIP network, there is a signaling protocol and a speech transmission protocol. The most common signaling protocol used is Cisco's SCCP (Skinny) protocol. RTP is the standard speech transmission protocol used with VoIP networks. VoIP helps in reducing long distance charges, especially international long distance, reducing staff by combining voice-network and data-network management and eliminating redundant functions, adding expanded applications that are not offered by TDM-based systems, having one common network for different forms of communication, TDM vendors are not offering new systems, thus forcing customers to eventually adopt IP-based telephone systems. The paper also mentions two major categories of IP phone implementations: hard phone and soft phone and how VoIP works. Local (LAN) and Wide Area Networks (WAN) can both support VoIP operation. Security of VoIP has become a major concern for VoIP adopters. VoIP requires expanded knowledge and tools to deploy and troubleshoot IP phones.
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