--- title: SIP Trunking Explained description: SIP Trunking and VOIP are common terms in the telecommunications world, but the terms may be lost on you. We'll explain. image: https://solutions.atsihou.com/hubfs/SIP_ATSI_2019_5_28.png --- - [** 713.622.8666](tel:7136228666) - [**](https://www.linkedin.com/company/atsi) - [![](https://solutions.atsihou.com/hubfs/Video/gx_icon-twitter-x-off-white.svg)](https://twitter.com/ATSIHouston) [![ATSI](https://solutions.atsihou.com/hubfs/ATSI_August2018%20/Images/logo-atsi@2x.png) ](https://atsihou.com) # ATSI Blog # SIP Trunking Explained Posted on May 15, 2019 [ATSI Content Team](https://solutions.atsihou.com/blog/author/atsi-content-team) ![ATSI Content Team](https://solutions.atsihou.com/hubfs/logo-atsi@2x.png) Find me on: [LinkedIn](https://www.linkedin.com/company/atsi/) [Twitter ](https://twitter.com/ATSIHouston) - [Tweet](https://twitter.com/share) *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** VOIP stands for Voice over Internet Protocol, which is technology used to transmit voice calls over a data network.  **PBX **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.  [![Learn More About ATSI's Carrier Services](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/4328473/418350bb-9d23-4fa9-ba43-b3deaabb48a8.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/4328473/418350bb-9d23-4fa9-ba43-b3deaabb48a8)   ![SIP_ATSI_2019_5_28](https://solutions.atsihou.com/hs-fs/hubfs/SIP_ATSI_2019_5_28.png?width=800&name=SIP_ATSI_2019_5_28.png)   Topics: [Business Communications](https://solutions.atsihou.com/blog/tag/business-communications) ### Subscribe Here! ### Recent Posts ### Posts by Tag - [Business Communications (26)](https://solutions.atsihou.com/blog/tag/business-communications) - [Cloud Solutions (19)](https://solutions.atsihou.com/blog/tag/cloud-solutions) - [Business Communications Systems (16)](https://solutions.atsihou.com/blog/tag/business-communications-systems) - [Technology Trends (16)](https://solutions.atsihou.com/blog/tag/technology-trends) - [Business Phone Systems (14)](https://solutions.atsihou.com/blog/tag/business-phone-systems) - [Artificial Intelligence (10)](https://solutions.atsihou.com/blog/tag/artificial-intelligence) - [Data Connectivity (9)](https://solutions.atsihou.com/blog/tag/data-connectivity) - [IT (9)](https://solutions.atsihou.com/blog/tag/it) - [GoTo Connect (8)](https://solutions.atsihou.com/blog/tag/goto-connect) - [Internet (8)](https://solutions.atsihou.com/blog/tag/internet) - [Internet Safety (8)](https://solutions.atsihou.com/blog/tag/internet-safety) - [business (6)](https://solutions.atsihou.com/blog/tag/business) - [Customer Service (5)](https://solutions.atsihou.com/blog/tag/customer-service) - [Office Trends (4)](https://solutions.atsihou.com/blog/tag/office-trends) - [Ransomware (4)](https://solutions.atsihou.com/blog/tag/ransomware) - [VPN (4)](https://solutions.atsihou.com/blog/tag/vpn) - [VoIP (4)](https://solutions.atsihou.com/blog/tag/voip) - [Digital Privacy (2)](https://solutions.atsihou.com/blog/tag/digital-privacy) - [Unified Communications (2)](https://solutions.atsihou.com/blog/tag/unified-communications) - [5G (1)](https://solutions.atsihou.com/blog/tag/5g) - [Analytics (1)](https://solutions.atsihou.com/blog/tag/analytics) - [Cybersecurity (1)](https://solutions.atsihou.com/blog/tag/cybersecurity) - [Insider (1)](https://solutions.atsihou.com/blog/tag/insider) - [Network (1)](https://solutions.atsihou.com/blog/tag/network) - [Wi-Fi (1)](https://solutions.atsihou.com/blog/tag/wi-fi) - [data privacy (1)](https://solutions.atsihou.com/blog/tag/data-privacy) [See all](https://solutions.atsihou.com/blog/sip-trunking-explained#) ![ATSI](https://solutions.atsihou.com/hubfs/ATSI_August2018%20/Images/logo-atsi-white.svg) ## ATSI ** [16000 Barkers Point Lane, Suite 265 Houston, TX 77079](https://maps.app.goo.gl/Gg8rEEWGqPbYmpTA7) ** [713.622.8666](tel:7136228666) Ph ** [contact@atsihou.com ](mailto:contact@atsihou.com) [**](https://www.linkedin.com/company/atsi/) [![](https://solutions.atsihou.com/hubfs/Video/gx-icon-social-x-twitter-white.svg)](https://twitter.com/ATSIHouston) ©2026 ATSI Business Communications Systems ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "ATSI Content Team", "url" : "https://solutions.atsihou.com/blog/author/atsi-content-team" }, "dateModified" : "2019-10-30T18:32:36.872Z", "datePublished" : "2019-05-15T23:05:00.000Z", "headline" : "SIP Trunking Explained", "image" : [ "https://solutions.atsihou.com/hubfs/SIP_ATSI_2019_5_28.png" ], "mainEntityOfPage" : { "@id" : "https://solutions.atsihou.com/blog/sip-trunking-explained", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://solutions.atsihou.com/hubfs/logo-atsi@2x.png" }, "name" : "ATSI" } } ```