This paper discusses various aspect of VoIP, including the challenges, application areas, and the standards. The paper elaborates issues and challenges of VoIP. The key issues are providing QoS, maintaining network transparency, and providing inter-working between heterogeneous networks. The paper also talks about VoIP applications including Internet telephony, VOIP based call-centers, and trunking applications. VoIP-related standards, as defined by ITU-T and IETF are described along with the key standards H.323, MGCP/MEGACO, and SIP. Finally, the paper talks about DSQ’s VoIP offerings.
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