May have missed it in this thread, but the PJSIP wizard is your friend – albeit a text-based one:
Slightly aside, the documentation is going through some remodeling, so please try to look past the extra pipes lying around in there.
unless your are encrypting your SIP trunks, neither is more secure than the other.
There’s a zillion videos on youtube on sniffing VoIP.
Assuming a cracker can access your network packets from your voip provider, unless your calls are encrypted, they can listen in
and if the encryption is merely between you and the voip provider, at least if the voip provider is in the US they are required to have an eavesdropping tap that LEOs can access (and, crackers too!)
Your VoIP provider should have asked you for your static public IP and installed that in their firewall to permit your trunks to be accessed by you. You should have done the same. Even unencrypted trunks that have no userID/password on the registration are fine if they are protected this way.
It is not uncommon that novices are misled by FUD from people handwaving around “security” as if it’s a holy grail. A novice should, IMHO, never be in charge of implementing any kind of network security, that is a very advanced thing and only people who have a thorough knowledge of the systems and protocols in use should be responsible for security. There is no shame in saying to your bosses “I’m not qualified to secure trunks, if you want that, pay a consultant” A novice needs to focus on getting things WORKING and then developing an understanding of the system from that effort. It’s not fair to throw them in with the sharks in the “security” pool.
Thank you for this, I will give it a read. 
Thank you for your reply and insight. I agree that encryption is the best way to protect yourself and have a wireguard tunnel between my devices (for family members) but when connecting to the provider this is out of our hands.
“Your VoIP provider should have asked you for your static public IP” the VOIP provider in question is my ISP so they already have my static IP, who knows maybe they are blocking all others. I have no idea. As I stated earlier, communicating with a big company like that is painful.
You seem to be complaining about misinformation, and as you can see not many people replied to set the record straight, apart from yourself. If no one corrects errors then they will be passed off as fact. So hopefully others will help each other, how the internet used to be.