Sony SPP-A945 - Manual (Page 24)

24 EN Telephone Features
Having a three-way conference
To join the phone
conversation
Press (TALK/FLASH).
If you are at the base phone, press
(SPEAKERPHONE).
The handset and the base phone operate like two extensions on the
same line. Both phones can operate at the same time, so that you, the
outside caller, and the person at the other phone can engage in a three-
way conversation.
(SPEAKERPHONE)
(OFF)
When you are done talking
Press (OFF) on the handset/(SPEAKERPHONE) on the base phone,
respectively.