The Yealink T23GN VoIP/SIP Phone is a cost effective IP business phone featuring an intuitive user interface with secure provisioning and HD audio for excellent voice quality. This Yealink T23GN VoIP phone is ideal for those working in small and large office environments requiring Gigabit Ethernet and access to a variety of enhanced features. Power Indication LED – It will show the power status, it will be on if the phone is powered, off if the phone is not powered. Context-sensitive Softkeys – The screen will display labels for these keys, to identify their context-sensitive functions. Account Buttons – This buttons are used to active up to the three user accounts. Dial Pad – Use the DTMF hard keys to enter numbers, letters and special characters. Depending on the selected input mode, you can enter digits, lower / upper case or special characters. Navigation Keys – Use the navigation keys to navigate in the display menus and confirm and cancel actions. Codec Selection – The IP phone supports the following voice codecs: G.722, G.711, G.723.1, G.726, G.729AB, iLBC and GSM. You can enable/disable the desired codecs via Web interface. Please contact your System Administrator for more details about the codecs.