Problem with caller ID when redirecting calls


I have a problem with my configuration :

I receive calls via IAX2, and these extensions are set to send the call to SIP extensions (dial SIP/ext in the device options)
The problem is that when the call is passed to the SIP extension, the caller ID is set to the first IAX2 extension number. And everytime the first one.

So I really do not understand what causes that.

Plus, if I set a password on this first IAX extension, calls are… somehow ignored. well, not really, but the server get the call, and doesn’t do anything with it.

Please ask if a configuration file could be useful, i will simply post a log for now. there it is

Thanks for reading my bad english ^^