Specifications

User Guide for the SIP-T48G IP Phone
164
 You can also find the MAC address from the phone’s bar code on the back of the
phone.
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 12.
 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 33.
Why can’t I receive calls?
 Check the SIP registration with your system administrator.
 Check that the DND (Do Not Disturb) mode is deactivated on your phone. Refer to
Do Not Disturb (DND) on page 110.
 Check that call forward is disabled on the phone. Refer to Call Forward on page
115.
 Check whether the caller number is stored in the blacklist directory. Refer to Blacklist
on page 56.
Why does my handset not work?
Check that the handset cord is fully connected to both the handset jack on the phone
and handset. Refer to Phone Installation on page 12.
Why does my headset not work?
 Check that the headset cord is properly connected to the headset jack on the
phone. Refer to Phone Installation on page 12.
 Check that the headset mode is activated. Refer to Headset Use on page 65.
 Check that the headset volume is adjusted to an appropriate level. Refer to Volume
on page 33.
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