Yealink SIP-T21 E2 User Manual page 168

User Guide for the SIP-T21(P) E2 IP Phone
Check that the headset mode is activated. Refer to

Check that the headset volume is adjusted to an appropriate level. Refer to

on page 33.
Why can't I get a dial tone?
Check for any loose connections and that the phone has been installed properly.

For the installation instructions, refer to
Switch between the Handset, Headset (if present) or Hands-Free Speakerphone to

check whether the dial tone is present for one of the audio modes.
If the dial tone exists on another audio mode, connect a different handset or
headset to isolate the problem.
Why doesn't the phone ring?
Check the ringer volume on the phone. To adjust the ringer volume setting, press the
Volume key when the phone is on-hook and idle. For more information, refer to
on page 33.
Why does the phone play a tone when there is a call on hold? How to disable it?
When there is a call on hold, the phone will play a hold tone every 30 seconds. Call hold
tone is enabled by default. Call hold tone and the interval of playing a hold tone are
configurable via web user interface only.
To configure call hold tone and call hold tone delay via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Play Hold Tone.
158
Headset Use
Phone Installation on page 13.
on page 54.
Volume
Volume