D735: Save original caller ID after hangup for transfered calls?

I have several D735 running on a FusionPBX/Freeswitch PBX. When someone does an attended transfer from one phone (10) to another (20), the second phone shows the original caller ID (123456789). However, once one hangs up, the call log will only show the caller ID from the phone that initiated the transfer (10), not the original caller ID. It works for blind transfers but those are not desirable in our org. Is there a way to tell the D735 to record the original caller ID in the call log? 

TIA

Alessandro