X-lite and dailing extions

I have x-lite 3 and for some odd reason when the I dial a company that need me to enter an extion it does not work
It just keeps with the voice message and final gets to a voice operate vm box

What does this have to do with FreePBX?

backend is on a free pbx system

it’s most likely a DTMF issue. Check with your SIP trunk provider and see what settings they require, such as “Auto”, “In-Band”, etc.

Or you can just change the settings for your extension until it works.

Actually the settings in your trunk.

“A FreePBX System” is not a responsive answer.

To help we need to know FreePBX, version, if a distro which one and if not what OS and Asterisk version.