Cordless Landline Telephone Support 4G Network IP Phone 2.4in Color Screen VOIP Phone Portable WiFi Phone Item Type: Cordless Landline Telephone Material: ABS Memory Card Maximum Support: 256G(Not Included) Support: 2 Atandard SIM Cards (Not Included) Polymer Lithium Battery: 1600mAh (Shipped with Matching Battery) Screen Size: 2.4 Inch Screen Color: Color Screen European Version of the Band (Consult the Local Operator to Support the Service):B2,B3,B5,B8 (2G);B1,B5,B8 (3G);B1,B3,B5,B7,B8,B20,B38,B40,B41 (4G) WIFI: IEE802.11b/g/n Support Phone Features: Add/Delete Contacts, No Disturb for Missed Call Alerts, Auto Answer Call Forwarding/Call Forwarding Configuration Management: Support for TFTP/PnP/DHCP/One Click Update Mode Automatic Deployment; TR069 Remote Configuration Network Security: Support UDP/TCP/TLS; Automatic Synchronization of Date and Time Via SNTP Fidelity Sound Quality: HD Hands Free HD Joystick Support: Bluetooth/Wifi/Talking VOIP Parameters: SIP Protocol: SIP 2.0(RFC3261) Transport Protocol: UDP/TCP/TLS DTMF : In band,Out of band(RFC 2833) and SIP INFO Voice Frequency Coding: G.722/G.729/AMR/AMRWB/GSM/PCMA/PCMU/SPEEX/ILBC/DTMF/ISCWB VOICVoice Frequency Function: AEC/VAD/CNG/AGC/ANS SRTP: NONE/FORCE/PREFER 3GPP: TS 24.605 Call Forwarding: Support STUN: Support SIPLine: 3 Lines