SIP trunking vs. VoIP: What’s the difference?

SIP trunking vs. VoIP: What’s the difference?
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SIP trunking and VoIP share some similarities, but they have key differences in origin and functions. How well do you understand these telephony cornerstones?
Jon Arnold, J Arnold & Associates
Published: 07 Oct 2020
SIP trunking and voice over IP are the cornerstones of IP Telephony PBX PBA Doha Qatar. Together, they provide the foundation for new capabilities that save money and make employees more productive. Aside from creating more options for voice communication in the workplace, they also give rise to platforms like unified communications (UC). These capabilities are simply not possible using legacy telephone networks or routing calls over the public switched telephone network (PSTN). But it’s important to understand the key differences between SIP trunking vs. VoIP.
What is VoIP?
VoIP, or voice over IP, is perhaps the most important acronym in the communications space, as every real-time application used in the workplace today follows in VoIP’s footsteps. It was commercialized in 1995 and was a radical breakthrough that enabled real-time transmission of voice over a data network, such as the internet.
Previously, all fixed-line telephony was carried over purpose-built voice networks run by incumbent phone companies. Collectively, these networks comprised the PSTN and, while it provided rock-solid five nines reliability, the incumbents held a monopoly on phone service that became the impetus for VoIP to provide an alternative.
For enterprises, VoIP is often associated with phone systems — and for good reason. Legacy telephony has long been defined by phone lines connected by a trunking service — namely T1 lines — to a premises-based PBX system. Since the 1970s, the PBX has been the standard telephone network architecture in business environments — at least, until VoIP came along.

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