Having A Three-Way Conference; To Join The Phone Conversation - Sony SPP-205 Operating Instructions Manual

Having a three-way conference

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.

To join the phone conversation

(TALK)
When you are done talking
Press (OFF) on the handset (or press (SPEAKERPHONE) if you're at the
base phone).
Tip
While talking through the speakerphone on the base phone, if you pick up the
handset, the conversation will be continued between the base phone, handset
and outside caller.
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Advanced Features
Press (TALK).
If you are at the base phone, simply
press (SPEAKERPHONE).
(OFF)
(SPEAKERPHONE)