How to change CALLER ID before transferring calls

Hi Everyone,
I have attempted to modify the CALLERID using Set(CALLERID(num)=123456) before executing Transfer() and Dial(), but it seems to be effective only with Dial(). I would like to know if there is a solution to make Set(CALLERID(num)=123456) work with Transfer() as well.
Thank you.

There is no such solution. Even if there was, it may or may not work using the available SIP headers, because Transfer() is telling the remote side to go elsewhere. What callerid they use is up to them.

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