dslreports logo
site
spacer

spacer
 
    All FAQs Site FAQ DSL FAQ Cable Tech About DSL Distance DSL Hurdles »»
spc

spacer




how-to block ads




3. What are the advantages?

When you are using Public Switched Telephone (PSTN) line, you typically pay for the time you use: The more time you stay on the phone the more you'll pay. And you generally don't have the option of talking with more than one person at a time (or you can, but at increased cost).

With VoIP, you can talk all the time with any person you want (the requirement is that the other person has an internet connection), with no regard to distance, and you can talk with many people at the same time.

Not convinced? Consider that, at the same time, you can exchange data with people are you talking with, sending images, graphs and videos.

by KeysCapt See Profile

Like many new technologies, there have been some problems with VoIP. In order to be effective, voice data communication has to be a real time stream. (You wouldn't want to finish a sentence, then wait for many seconds before you could hear the other side answering.)

With normal internet protocols, you can have a network consisting of many routers (20 - 30 or more) which can result in a very high round trip time (RTT).

In addition to standard IP, VoIP uses the real-time protocol (RTP) to help ensure that packets get delivered in a timely way. Using public networks, it is currently difficult to guarantee Quality of Service (QoS). Better service is possible with private networks managed by an enterprise or by an Internet telephony service provider (ITSP).

As of this writing, VoIP is still plagued by lack of generally accepted interoperability standards.

by KeysCapt See Profile
last modified: 2002-06-10 01:27:51