Up to 16 SIP accounts. 7 fixed feature keys - message, headset, hold, mute, transfer, redial, hands-free speakerphone.LED for call and message waiting. 4-way navigation cluster with 6 navigation keys. 4 context sensitive soft keys. Supports up to 6 expansion modules for attendant console applications. Simple, flexible and secure provisioning options. USB 2.0 port for future Bluetooth, WiFi, and USB recording feature expansion. T4S series features unified Auto-P template and unified firmware that provides simplified management and maintenance. Opus codec support - 8kHz (narrowband) and 16 kHz (wideband) sampling rate. The item "Yealink SIP-T48S Gigabit VoIP IP Phone PoE (Power Supply not Included)" is in sale since Saturday, February 16, 2019. This item is in the category "Computers/Tablets & Networking\Enterprise Networking, Servers\VoIP Business Phones/IP PBX". The seller is "jkgator99" and is located in Senoia, Georgia. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Chile, Colombia, Costa rica, Dominican republic, El salvador, Viet nam, Uruguay.