I have a location that is having an issue with forwarded calls CLID. When I call forward all my phone to an external number (i.e. Cell Phone) I lose the calling number display. I have verified that my gateway is passing the correct calling party number to telco, but telco is overwriting with the BTN. Regular outbound calls pass the correct CLID. Telco claims that this is a security feature and is not allowed on purpose. They only allow calling number display for numbers assigned to the local PRI. Why shouldn't I be able to forward my phone to my cell and see the calling number of who is actually calling me? This works at many other sites.