HI, Thank you so much for your reply When I try to put in a range 9000-10999, it wont let me put in more than 5 digits. Please see below if i understood you correctly.
I don't know the Tenda AC200.
Normally you would be able to open a Range of ports on your firewall.
(and for the 5001 please change to TCP only)
Here you will find info in regard to Firewall Configuration, and at the bottom of the document, there are links to several "Step by Step guides", perhaps one of these will help you in the right direction for your Firewall configuration, or you might Google search for your Firewall name + 3CX and see what you get
You need to put the correct ports in to your firewall, its the same for FreePBX... Why not have a look at the manual from your router? https://www.tendacn.com/us/faq/1868.html