Yealink SIP-T21 - Manual (Page 82)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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The LCD screen indicates that the call is on mute.
To un-mute a call:
1. Press again to un-mute the call.
You can place an active call on hold. Only one active call can be in progress at any time.
Other calls can be made and received while placing the original call on hold. When you
place a call on hold, your IP PBX may play music on hold to the other party while
waiting.
To place a call on hold:
1. Press the Hold soft key during a call.
The line key LED flashes green. The LCD screen indicates that the call is on hold.
Note
To resume a held call:
1. Press the Resume soft key.
Multiple Calls on Hold:
If multiple calls are placed on hold, do one of the following:
- Press or to switch between the calls, and then press the Resume soft key
to retrieve the desired call.
- Press the corresponding line key to retrieve the desired call.
If more than one call is placed on hold, a numbered prompt appears on the LCD screen,
The phone will beep softly every 30 seconds to remind you that you still have a call on
hold.