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As packet-based transmission protocols come to dominate telecommunications networks, Internet Protocol (IP) telephony is steadily replacing circuit-switched voice lines. This evolution presents challenges to equipment manufacturers and service providers as they invest in networks designed principally for data transmission, while still providing support for voice services. In fact, the issue of voice quality is one of the major barriers limiting adoption of Voice-over-Packet telephony, despite the potential for packet voice services to provide enhanced features and benefits to users. Voice-over-Packet (VoP) technology converts analog voice traffic from the circuit-switched format used in older telephone and wireless cellular networks into packets that can travel over IP or Asynchronous Transfer Mode (ATM) networks (figure 1). Because the packet networks are optimized to meet the requirements of data transmission, effort is needed to achieve consistent high quality audio. This paper discusses how echo contributes to poor audio quality in VoP telephony, and examines how other factors that are specific to IP networks, such as delay, jitter and packet loss, increase echo problems.
Approximate Word count = 637
Approximate Pages = 2.5
(250 words per page double spaced)
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