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VoIP Service
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Traditional PSTN Phone Service |
Free Calls
|
 VoIP calls to/from VoIP
|
N/A
|
Premium Features * :
■ Call waiting
■ Call Forwarding
■ Call Transfer
■ Caller ID
|
Available for free
|
Often available at an extra cost
|
Local and International call cost *
|
Lower monthly cost
|
Costs are typically higher |
Mobile call cost *
|
Lower monthly cost
|
Costs are typically higher |
Gateway Feature - Least Cost Routing **
|
Allows user to choose the most economical rate of VoIP calls provided by varying ITSP
|
Provided by a single teleco, meaning there is very limited least cost routing
|
Remote Extensions for
Tele-workers and branch-offices
|
|
Very costly and require dedicated lines for each remote extension |
Expandability and Upgradeability |
Often just requires more Internet bandwidth and software upgrades. |
Very Complicated. Additional hardware and new line subscription are usually required
|
VoIP vs. PSTN Phone 
