There seems to be some problems transferring calls between Siemens Gigaset C467 handsets when on the same base station. It’s not a perfect fix but #3 does what we needed.
There are three ways to try transfer inbound calls on the Gigaset C475 handset:
1) Doesn’t work for transfers to/from handsets on same basestation:
options > external call > extentension number > send > hangup
2) Doesn’t work for transfers to/from handsets on same basestation:
# key > extension number > conf > hangup
3) Does work for transfers to/from handsets on same basestation only:
left menu button > base station extension > call > conf / convereference > hangup
