SIP Trunking Explained

Posted on
May 15, 2019
ATSI Content Team
ATSI Content Team
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SIP Trunking (or SIP Trunks), PBX and VOIP are common terms in the telecommunications world, but if you aren't involved in that industry, then the term is probably lost on you. Have no fear, ATSI is here! We're here to help you understand what these terms mean and how they might pertain to you. 

VOIP stands for Voice over Internet Protocol, which is technology used to transmit voice calls over a data network. 

PBX stands for Private Branch Exchange, which is a private, legacy phone system used within an organization. PBX systems can use different communication channels — including VOIP.

SIP Trunking
SIP Trunking is a separate kind of VOIP. SIP is short for Session Initiation Protocol. A SIP session can be anything from standard phone call from one person to the next, a group conference call or a video conference call. A SIP Trunk is the connection between your phone system and the public switched telephone network — it just uses data to connect your phone to the network virtually, instead of a physical telephone wire.

SIP Trunking is cheaper than traditional telephone services, so it's quickly growing in popularity with businesses. It's also more resilient than traditional phone lines — meaning that it holds up better during natural disasters, lessening the negative impact on your business and allowing you to recover faster. 

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Topics: Business Communications