4 Line Dis 5 Function Key 4257 SIP Phone

- D305 SIP Desk Phone with HD Audio and Sensor Hook Switch- Digital Signal Processor (DSP) enhanced audio quality- Sensor hook switch- Number of SIP Accounts: 4- Up to 4 simultaneous calls- XML browser- Call lists for dialed, received, missed calls- Local directory with 1000 entries- Multiple language support- DTMF in-band out-of-band SIP-INFO- Interoperable with all major IP-PBX platforms- LCD Display: 4-line backlit- Context Sensitive Keys: 4- Function Keys with LEDs: 5- Desk or wall mounting- Integrated 2-port 10100 Mbps Ethernet switch (RJ45)- PoE 802.3af, Class 1- Power supply not included- Music on hold- Multicast paging- 3-way conferencing- Audio Codecs: G.711 a-lawu-law, G.726, G.723AB, GSM 6.10, G.722 (wideband)- SIP protocol RFC3261- VPN support- Transport layer security (TLS)- Optional US power supply: 5V DC adapter, part number 4326- Handset: 4P4C connector- Headset: 4P4C connector- Add Snom EHS adapter for wireless headset EHS capability (part number 2362)- Package Includes: phone, footstand, handset with cord, Ethernet cable, quick start guide