PSTN vs VoIP
What's the difference between PSTN and VoIP?
When placing a phone call using PSTN, or Public Switched Telephone Network, you use circuit-switched telephony. In this system, for the duration of a call, two points are connected through a dedicated circuit or channel. PSTN carries analog voice data, thru copper wiring, over the two dedicated channels.
VoIP, or Voice over Internet Protocol, being a newer technology, is based on internet technologies. It is a digital, opposed to the anolog system PSTN uses. VoIP uses packet-switched telephony to transfer voice information across the Internet thru individual network packets.
VoIP vs PSTN comparison chart:
|Channels carried over on Internet connection||Carried through dedicated lines|
|Carried at 10kbps in each dirrection||Each line is carried at 64kbps in each dirrection|
|Features, such as Caller ID, and Call Waiting are typically included free with service||Features, such as Caller ID and Call Waiting are available at an extra cost|
|Can be upgraded by software upgrades and bandwidth||Requires new equipment to be upgraded or expanded|
|Long distance calls are typically included with service||Long distance calls usually cost per minute or through bundle subscription|
|If no power, no service||Can use during a power outage|
|911 calls can't always be traced to a location||911 calls can be traded to a location|