RCA 25403 - Manual (Page 28)

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Operation
Volume
The ringer, speaker, and handset/headset volume is set independently with the VOLUME up and down buttons. There are 8 possible volume
settings per mode. The volume indicator scale is displayed during volume adjustment.
Ringer Volume
1. While the phone is on the hook, press the VOLUME up or down button. The phone rings according to the current setting.
2. Tap the up or down button to adjust the volume one level at a time. The phone stores the setting after the last button press.
NOTE: To turn the ringer off, on, or change the ringing pattern, see Setting the Ringer Tone.
Speakerphone, Handset, and Headset Volume
While the phone is in use, during the desired mode, press the VOLUME up or down buttons until you reach a comfortable listening level. The
phone stores the setting after the last button press.
Conference Calls
This feature allows you to have a 3-way conversation using any combination of 2 lines.
To connect and conference
1. To make a call, press the line you want and dial the telephone number. If you already have someone on the line, skip to step 2.
2. Press the HOLD button to place the call on hold.
3. Press another line button and dial the telephone number of the party you want to conference with.
4. Press the CONFERENCE button.
5. Speak to both parties.
NOTE: If you have more than one line on hold, and you want to have a conference call, you must first select the line on which you want to conference.