Điện thoại IP Yealink SIP-T48G Phone Features 6 VoIP accounts Call hold, mute, DND One-touch speed dial, hotline Call forward, call waiting, call transfer Group listening, emergency call Redial, call return, auto answer 3-way conferencing Direct IP call without SIP proxy Ring tone selection/import/delete Set date time manually or automatically Dial plan, XML Browser, action […]