Yealink SIP-T48G Gbit VoIP Phone Ultra-Elegant Touchscreen The Yealink T48G is a 16-line (with Firmware version V73) Gigabit SIP phone ideal for heavy phone use and traffic. 16 VoIP accounts Codecs: G.722, G.711(A/), G.723.1, G.729AB, G.726, iLBC 3-way conferencing, One-touch speed dial, hotline, Call forward, call waiting, call transfer, Group listening, emergency call, Redial, call return, auto answer 7 features keys: message, headset, hold, mute, transfer, redial, hands-free speakerphone