Keep CID with Misc Destibnation Forward


when i forward calls vis ISDN with MIsc Destination it does not uses the CID where the call came in, instead it uses the first MSN of the account.

How can i set that it uses the same CID that was called:


Somebody calls to 123456 and is forwarded external … on the external phone i see 023456 as calling number
I need it that i see the 123456 as calling number,

Many thanks for your help and best regards