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KT581P IP-Phone
Feture rich VOIP Telephone 
- Vxworks OS
- Support SIP2.0 (RFC3261) and correlative RFCs
- SIP support 2 SIP servers, and backup SIP proxy servers
- Supports SIP UDP / TCP/ TLS
- SIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer / IP Call
- Display Resolution: 128x48 with Backlight
- Large dot matrix LCD display and soft keys make user easier to use
- Soft keys programmable
- Function keys programmable (each key have 2-color led indication)
- Supports RJ-9 headset
- Multi languages displayed
- HD voice: HD handset
- Codec: G.711A/u, G.7231 high/low, G.729AB, G.722, G.726-32
- DTMF: In-band, RFC 2833 and SIP INFO
- Full duplex hands- free speaker phone with acoustic echo cancellation
- Voice Activity Detection (VAD)
- Comfort Noise Generation (CNG)
- Background noise suppression
- Adaptive jitter buffers
- Packet loss concealment
- SRTP
- Mute
- Call forwarding (busy/ no answer/ always)
- Call transfer (unattended / attended / semi-attended)
- Call holding
- Call waiting
- 3 way call conference
- Capable of 10 way conversation
- BLF list
- Join call
- Call pickup
- Call park
- Redial
- Call back
- Call completion
- Hot desking
- Auto redial
- Pre-dial
- SIP messaging, MWI
- Flexible dial plan
- Barring function for outgoing calls
- Do not disturb
- Auto answer
- Caller ID display
- 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
- Phonebook 500 records
- Speed Dial (abbreviated dialing)
- Hotline/Warm-line
- Call rejection
- Black List/ White List
- Intercom/Intercom barge
- Password dial, DTMF hidden
- Action URL/ active URI
- Voice codec setting for each SIP line
- Multicast
- LDAP, XML phonebook
- Web dial
- Keypad lock, Emergency call
- WAN / LAN：10/100M Ethernet ports
- Bridge mode and route
- PPPoE for xDSL
- 802.3af POE (optional）
- VLAN（Voice VLAN/Data VLAN）
- 802.1X
- NAT (NAPT)
- NAT transverse: Support STUN client
- DHCP client on WAN/ DHCP server on LAN
- Main DNS and secondary DNS server
- DNS Relay
- SNTP Client
- Firewall and DMZ
- Web management access restricted
- VPN (L2TP/Open VPN)
- Ping, tracer, telnet
- WEB, telnet and LCD menu management
- Management with different account right
- Recover firmware and factory reset through POST mode
- Upgrade firmware via HTTP, HTTPS, FTP, TFTP
- DHCP option66 and custom option for auto provisioning
- Auto Provisioning to upgrade configuration file with AES (256) encryption
- TR-069 and Syslog
- Adapter Input: AC 100-240V
- 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
- Headset: RJ9
- Power consumption: IDLE: 2.5W Active: 2.8W
- Display Resolution: 128x48 pixels
- Operation Temperature: 0〜40℃
- Relative Humidity: 10〜65％
- Main Chipset: Broadcom
- SDRAM: 16MB
- FLASH: 4MB
- Weight- Phone: 0.99kg
- Dimension: 235x225x97 mm
