I’m asked this question a lot, so I thought it’d be a great blog topic.
I don’t think you are as concerned with this as the amber lights in the server room… But if you are making any changes to your company’s phone system, I’m assuming this question is on your mind.
The simple answer is… no. SIP trunks are not as reliable. They are more reliable than a Primary Rate Interface (PRI). But it has nothing to do with the public Internet.