The basics of SIP trunking explained
A comprehensive collection of articles, videos and more, hand-picked by our editors
What's the difference between Voice over Internet Protocol (VoIP) and Session Initiation Protocol (SIP) trunki...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
SIP trunking and VoIP are the cornerstones of IP telephony. Together, they provide the foundation for new capabilities that save money and make employees more productive. VoIP is likely more familiar to readers and refers to the IP-based version of legacy telephony.
As such, VoIP is a service, like dial tone, that businesses subscribe to just as they would with a time-division multiplexing (TDM) service. The main difference is that VoIP calls run over a data network, whereas TDM calls run over a circuit-switched network that is dedicated solely to telephony.
SIP trunking shares similar parallels to VoIP, where the equivalent in the legacy world would be PBX trunks. SIP trunks differ from PBX trunks in that they carry all forms of media, not just voice. Being designed for use in a data network, SIP trunks transmit packets, which could carry voice, data or video. This makes them more flexible than PBX trunks, as well as more cost-effective, since voice can be added to this channel, reducing the need for legacy connectivity.
SIP trunks are the physical connections that provide voice service to your phone system. PBX trunks only carry voice. They are expensive and inflexible but very reliable. VoIP can be routed over PBX trunks via a media gateway, but to take full advantage of VoIP's capabilities, businesses will deploy SIP trunks and typically route these calls via a session border controller.
Related Q&A from Jon Arnold
The collaboration software market has become quite crowded. UC expert Jon Arnold explains how organizations can cut through the noise and find the ...continue reading
Telephony expert Jon Arnold explains how large and small organizations can evaluate the compatibility of their desk phones with a Skype for Business ...continue reading
Online whiteboards can be used for much more than basic note taking. UC expert Jon Arnold explains why whiteboard collaboration is vital to virtual ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.