Siemens 600 Series - Manual (Page 68)

3–4 ROLMphone 300/600 User Guide
Note
If you press the Transfer key during a bridged call,
your telephone will be removed from the call.
You cannot bridge a conversation on an extension set
up for Privacy. Also, once you have bridged into a
conversation, the party at that extension can exclude
you by pressing the Privacy key. (See “Privacy” on
page 6–4.)
Bridging overrides Do Not Disturb mode. (See “Do
Not Disturb” on page 6–3.)