VoIP Versus PSTN
VoIP (Voice over the Internet Protocol) also known as Internet Telephony isn’t really a new technology — it’s been around for many years in one form or another, but only fairly recently has it become reliable and ubiquitous enough to be a serious choice for business. While Internet telephony was once an oddity often plagued for garbled and dropped calls, these days a well-planned and implemented VoIP system can provide call quality and reliability that rivals mobile phone or landline calls.
How VoIP WorksTo understand how
VoIP, short for Voice over Internet Protocol, works, it’s helpful to compare it to how conventional phone calls operate. When you place a “regular” phone call using the Public SwitchedTelephone Network (PSTN), also known as Plain Old Telephone Service (POTS) you use what’s called circuit-switched telephony. This system works by setting up a dedicated channel (or circuit) between two points for the duration of the call. These telephony systems are based on copper wires carrying analog voice data over the dedicated circuits.
This is in contrast to newer Internet telephony networks based on digital technologies. VoIP, in contrast to PSTN, uses what is called packet-switched telephony. Using this system, 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 Versus VoIP: A Feature Comparison