Sony IT-M804 - Manual (Page 36)

Basics 36 US
Receiving calls (continued)
Receiving a call while talking
If another call comes in while talking on the other line, the
corresponding line button will flash and two beeps will be heard from
the speaker.
Example: Receiving a call on line 2 while talking on line 1
1
Press (HOLD).
Line 1 is put on hold and the LINE 1 button flashes slowly.
2
Press (LINE 2).
Now you can talk to the other caller on line 2.
To disconnect line 2, press (LINE 1).
Note
If you do not press (HOLD) in step 1, line 1 will be disconnected.
To talk with two parties at the same time using both line 1 and line 2,
see “Having a three-way conference call” on page 48.