Transfer with announcement

I can’t find the way to transfer the call and talk with the transfer destination.

This is an explanation:
ext1 calls ext2
(ext2 want to transfer the call to ext3)
ext2 click on transfer button on the phone and make the ext3 number

I need that ext2 talk with ext3 before connect ext1 with ext3

How can I do it?

Thanks.

 Andrew

Have a look at your phone for attended transfers. What you are doing now is a blind transfer.