Integrated Ethernet switch, Multiple VoIP protocol support. Lightweight Directory Access Protocol (LDAP), Network Address Translation (NAT). DNS, HTTP, HTTPS, SNTP, TCP, TFTP, TR-069, UDP.Power Over Ethernet (PoE) Support. IEEE 802.1p, IEEE 802.1Q (VLAN), Type of Service (ToS). Acoustic echo cancellation (AEC), Adaptive jitter buffer (AJB), Automatic gain control (AGC), Comfort noise generation (CNG), HD Voice, Packet loss concealment (PLC), Voice activity detection (VAD). Android 5.1.1 (Lollipop). 4 pin USB Type A. Headset, Mute indicator, Speakerphone indicator, Visual ringer light, Voice message waiting indicator. Key Expansion Module Max Qty. The item "Yealink VoIP phone Bluetooth interface (SIP-T58A)" is in sale since Tuesday, July 9, 2019. This item is in the category "Computers/Tablets & Networking\Enterprise Networking, Servers\VoIP Business Phones/IP PBX". The seller is "tuksycom" and is located in Irvine, California. This item can be shipped worldwide.