# SIP Trunk connection? **URL:** \ **Category:** Ignition\ **Created:** [September 10, 2014, 4:50pm UTC](https://forum.inductiveautomation.com/t/sip-trunk-connection/9040 "2014-09-10T16:50:04Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![jmartell](https://avatars.discourse-cdn.com/v4/letter/j/779978/32.png) [@jmartell](https://forum.inductiveautomation.com/u/jmartell)\ **Post date:** [September 10, 2014, 4:50pm UTC](https://forum.inductiveautomation.com/t/sip-trunk-connection/9040/1 "2014-09-10T16:50:04Z")
I am currently working on setting up the voice notification with 3 different clients and each one has come back with the same question - one that I can’t find an answer to in the documentation or on the forums. The question: is this a SIP trunk connection? I’ve looked up some information on SIP and I have gotten a definition of what a trunk connection is, but that doesn’t tell me what type of connection Ignition is expecting. I suspect the answer is no based on a couple of posts I’ve seen involving “soft phones”, but I need a better answer than a hunch. ---
**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\ **Post date:** [September 10, 2014, 6:45pm UTC](https://forum.inductiveautomation.com/t/sip-trunk-connection/9040/2 "2014-09-10T18:45:37Z")
The technical answer is no. But then, neither is the majority of SIP hardware. Ignition doesn’t care whether a SIP trunk exists or not. That’s all dependent on hardware-- what negotiates the VoIP session-- and the service provider. A ‘gateway’ of some sort still exists, even if they use a trunk. Perhaps they need to provide what they are envisioning, if possible. ---
**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\ **Post date:** [September 10, 2014, 6:59pm UTC](https://forum.inductiveautomation.com/t/sip-trunk-connection/9040/3 "2014-09-10T18:59:09Z")
Here’s a white paper: [SIP Trunking Deployment Models](http://www.cisco.com/c/dam/en/us/products/collateral/unified-communications/unified-border-element/cis_45835_cube_assets_wp1e.pdf) It’s Cisco-centric, but the deployment models remain the same. 😉 ---
**Author:** ![jmartell](https://avatars.discourse-cdn.com/v4/letter/j/779978/32.png) [@jmartell](https://forum.inductiveautomation.com/u/jmartell)\ **Post date:** [September 10, 2014, 7:01pm UTC](https://forum.inductiveautomation.com/t/sip-trunk-connection/9040/4 "2014-09-10T19:01:32Z")
I appreciate that. It looks like an interesting read. I am a complete novice at VOIP systems in general so any information to bring me up to speed is going to help out a lot.