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VoIP White Paper

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Revised: February 8, 2007

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6 Conclusions

Other than new skills for both installers and administrators relative to data network Quality of Service (QoS)

that are discussed in the next sections, echo is the biggest hurdle for VoIP systems to overcome, as they

improve with each generation. Echo cancellers go a long way toward maximizing the user’s perceived audio

quality, but still represent one of the areas for the relatively new VoIP technologies to improve. Looking

forward, the quality and capabilities of echo cancellers will continue to improve, but the only thing that will

completely eliminate echo sources is when VoIP systems no longer need to interact with analog phone loops

that date back to the designs of Alexander Graham Bell. Once calls between all end points are completely

digital, the problem of occasional or persistent echo will be a thing of the past.

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