I call from my VOIP Extension to a cellphone, the cellphone gets a blocked CID.
when i call to another VOIP phone (extern) he gets my CID or any CID i provide for my extension
How do your outbound calls get connected...PSTN using gateway, PRI, sip, etc.?
How does the caller-I'd get presented to a landline phone (not an extension)?
If your outbound calls, route over the same trunks, and calls to a landline show your caller-ID, then, in theory, it should show on a call to a mobile as well.
But, as Ineblett, said, you need to provide more information.