Verizon VzB SIP Trunk

Is anyone else out there using VzB SIP trunk authenticating their calls to Verizon SBC using an assigned Call Screening Number and passing any number/CID info.

I was told that I should be able to use the screening call number, so the call is accepted on Verizon’s side but I can pass any caller ID info I want. Either a DID or spoof some other number.

Does anyone know what SIP headers need to be modified to do so?

issue got solved!! thankyou so much!!!