Changing "on call" forward function.

Hello,

I have a problem with call forwarding on my Yealink phones.

I can either use the phone box server-side call forwarding function by either calling ** (for attended transfer) or ## (for unattended transfer).
This works great.

Or I can use the Yealink Buttons (either the in-call soft-button or the hardware "transfer" button). But unfortunately when doing so the person the call is forwarded to sees the number of the forwarder not the caller.

Example:
external number: 081501
Internal number 1: 116
Internal number 2: 120

081501 calls 116. 116 forwards to 120. When using the server-side transfer 120 sees 081501 as caller id. When using Yealink transfer 120 sees 116 as caller ID.

SO I either need to change the behavior of the Yealink Transfer, or change the "Transfer" hardware and in-call button to just call "'**".

Any suggestions?

thank you
Daniel