The Avaya H249 device features a 3.5 inch color screen, HD voice, USB charging port and 6 programmable soft keys. H249 has a full duplex, hands free speaker phone with echo cancellation, along with many more standard phone features, such as call transfer, call holding, and call waiting. Specifications Phone Features Vxworks OS | Support SIP2.0 (RFC3261) and correlatice RFCs | SIP supports 1 SIP servers, and backup SIP proxy servers | Supports SIP UDP / TCP / TLS Key Features 6 soft keys programmable | Multi language displayed (web) Advanced Features Call transfer | Call holding | Call waiting | Redial | Call completion | Predial | MWI | Flexible dial plan | Barringfunction for outgoing calls | Do not disturb | Auto answer | CLIR (rejects anonymous calls) | CLIP (to make an anonymous call) | Dial without registration | Call logs with missed calls / incoming calls/outgoing calls (Each support 300 records) | Speed dial | Hotline / warm-line | Password dial | DTMF hidden | Action URL / active URI | Multicast | Web dial | Emergency call Network / Security Features WAN / LAN: 10/100M Ethernet ports (bridge mode) | IP configuration: Static / DHCP / PPPoE | Network access control: 802.1x | VPN:L2TP (basic unencrypted) / OpenVPN | VLAN | QoS Deployment & Maintenance Web management portal | Web-based packet dump | Configuration export/import | Firmware upgrade | Syslog Physical Features LCD: 3.5 inch (480×320) color screen | Adapter input: AC100-240V | Adapter output: DC 5V / 1A | WAN Port-10 / 100 BASE-T RJ-45 for LAN | LAN Port-10 / 100 BASE-T RJ-45 for PC | Handset: RJ9 | Power consumption: IDLE: 2.5 W active: 2.8W | Operation temperature: 0-40 °C | Relative humidity: 10~65% | Main chipset: broadcom | SDRAM: 16 MB | FLASH: 8 MB Call Control Avaya Aura, Avaya IP Office as well as the Powered by Avaya IP Office cloud service available from Avaya channel partners, and Avaya Approved Third Party Platforms