Caller ID - All Calls Come In Under Same Number

[chrisjr]

I'm using the latest 3cx official build and all incoming calls come under the same number which does not reflect the callers real phone number. Any ideas on how to fix this?

 

[Mirzab]

What number is shown? Is it the line number in 3CX? Who is the VSP? Or is it PSTN via Gateway? You will need to provide much more info I am afraid :?

 

[chrisjr]

More Info

The number shown is a test call we made from a cell phone. Our VOIP is Zingo and 3cx is directly connected to our router and is on a DMZ as well.
Today a different number is showing up. It must have been from a customer calling in this morning. But now all calls come under that number.