Yealink SIP-T42G - Manual (Page 126)

User Guide for the SIP-T42G IP Phone
116
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
Phone Installation on page 11 .

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
Volume
on page 26 .
Why can’t I receive calls?

Check the SIP registration with your system administrator.

Check that DND (Do Not Disturb) mode is deactivated on your phone. Refer to Do
Not Disturb (DND) on page 77 .

Check that call forward is disabled on the phone. Refer to Call Forward on page 80 .

Check whether the caller number is stored in the blacklist directory. Refer to Blacklist
on page 39 .
Why is my handset not working?
Check that the handset cord is fully connected to both the handset jack on the phone
and handset. Refer to
Phone Installation on page 11 .
Why is my headset not working?

Check that the headset cord is fully connected to the headset jack on the phone.
Refer to
Phone Installation on page 11 .

Check that the headset mode is activated. Refer to Headset Use on page 45 .

Check that the headset volume is adjusted to an appropriate level. Refer to Volume
on page 26 .
What is the difference between user name, register name and display name?
Both user name and register name are defined by the server. A user name is used to
identify the account, while a register name matched with a password is used for
authentication if the server requires. Display name is the caller ID that will be displayed
on the callee’s LCD screen. Server configuration may override the local configuration.