Mike Meyers' CompTIA Network+ Certification Passport by Michael Meyers

Author:Michael Meyers
Language: eng
Format: epub
Tags: -
Publisher: McGraw-Hill Education
Published: 2012-04-09T04:00:00+00:00

FIGURE 8.42 VNC in action

VoIP

Voice over IP (VoIP) uses an IP network to transfer voice calls. VoIP works so well because it uses an existing network you’re already paying for (your Internet connection) to replace another network you’re also paying for (PSTN lines). The technology needed for VoIP isn’t very challenging, but making a VoIP system that’s standardized so everyone can use it (and still contact those who choose to use PSTN) requires international standards, making it quite a bit harder. VoIP is still a very fractured world, but it’s getting closer to universally adopted standards—one day everyone will be able to contact everyone else, no matter what brand of VoIP they use. To do this, you need to know three important standards: RTP, SIP, and H.323.

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