User Guide for the SIP-T46G IP Phone64Why does the phone display "Network unavailable"? Ensure that the Ethernet cable is plugged into the Internet port on the phone and theEthernet cable is not loose. Ensure that the switch or hub in your network is operational.Call IssuesWhy can’t I receive calls? Check the SIP registration with your system administrator. Check that the DND (Do Not Disturb) mode is disabled on your phone. Refer to Do NotDisturb (DND) on page 55. Check that call forward is disabled on the phone. Refer to Call Forward on page 57.Headset & Handset IssuesWhy does my handset not work?Check that the handset cord is fully connected to both the handset jack on the phone andhandset. Refer to Phone Installation on page 10.Why does my headset not work? Check that the headset cord is properly connected to the headset jack on the phone. Referto Phone Installation on page 10. Check that the headset mode is activated. Check that the headset volume is adjusted to an appropriate level. Refer to Volume onpage 24.Audio IssuesWhy can’t I get a dial tone? Check for any loose connections and that the phone has been installed properly. For theinstallation instructions, refer to Phone Installation on page 10. Switch between the Handset, Headset (if present) or Hands-Free Speakerphone to checkwhether 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 toisolate the problem.