Showing my number in outbound calls

Hi all,

Well, i’m creating a FreePBX lan, with an french ISP and with the french telecom provider.
But I have some troubles : when I’m trying to do an outbound call, it show the first line number, like I have “0422112210” as a first number, and my phone have “0422112211”, but it show “0422112210” to the recipient of my call.

I tried to change the extension, with the CID or DID, but nothing work.

How can I make it work ?

Thank you for your replies,