User Guide for the SIP-T19P/SIP-T19 IP Phone102How to obtain the MAC address of a phone when the phone is not powered on?Three ways you can obtain the MAC address of a phone: You can ask your supplier for shipping information sheet which includes MACaddresses according to the corresponding PO (Purchase Order). You can find the MAC address in the label of carton box. You can find the MAC address from the phone’s bar code on the back of the phone.W hy 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) and Hands-Free Speakerphoneto 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 orheadset to isolate the problem.W hy doesn’t the phone ring?Check that the ringer volume on the phone. To adjust the ringer volume setting, pressthe Volume key when the phone is idle. For more information, refer to Volume on page27.W hy can’t I receive calls? Check that the SIP registration with your system administrator. Check that DND (Do Not Disturb) feature is disabled on the phone. Refer to Do NotDisturb (DND) on page 71. Check that call forward is disabled on the phone. Refer to Call Forward on page72. Check whether the caller number is stored in the blacklist. Refer to Blacklist onpage 40.W hy is my handset not working?Check that the handset cord is fully connected to both the handset jack on the phoneand handset. Refer to Phone Installation on page 11.W hy 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 ModeActivation/Deactivation on page 47.