How to make a change in incomming caller ID

Hello everybody,

We have a new Dutch trunk from Speakup.
The problem is how they deliver the other party`s caller ID.
31882701611 insted of 0882701611 or 0031882701611

I did try add this to the extensions_custom.conf;

[from-trunk-custom]
exten => _X!,1,Set(CALLERID(num)=00${CALLERID(num)})
exten => _X!,n,Goto(from-trunk,${EXTEN},1)

In my trunk I use content=from-trunk-custom

But no succes so fare...

Can somebody advice my?

Thanks Jacques