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Techsier’s Trivia

October 12th, 2008 by anyajulia
VoIP (Voice Over Internet Protocol)
This system uses packet-switched telephony wherein the voice information travels to its destination in countless individual network packets across the Internet. This type of communication presents special TCP/IP challenges because the Internet wasn’t really designed for the kind of real-time communication a phone call represents.
 PSTN (Public Switched Telephone Network)
 This is the usual phone system commonly used, known as a circuit-switched telephony, works by setting up a dedicated channel (or circuit) between two points for the duration of a regular phone call. This telephony systems are based on copper wires carrying analog voice data over the dedicated circuits.
  • All channels carried over one Internet connection
  • Compression can result in 10kbps (in each direction)
  • Features such as call waiting, Caller ID and so on are usually included free with service
  • Upgrades usually requires only bandwidth and software upgrades
  • Long distance is often included in regular monthly price
  • Lose power, lose phone service without power backup in place
  • 911 emergency calls cannot always be traced to a specific geographic location
  • Dedicated Lines
  • Each line is 64kbps (in each direction)
  • Features such as call waiting, Caller ID and so on are usually available at an extra cost
  • Can be upgraded or expanded with new equipment and line provisioning
  • Long distance is usually per minute or bundled minute subscription
  • Hardwired landline phones (those without an adapter) usually remain active during power outage
  • When placing a 911 call it can be traced to your location

source: http://www.webopedia.com/DidYouKnow/Internet/2008/VoIP_POTS_Difference_Between.asp

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