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Grandstream single line SIP telephone
- 1 line appearance with FLASH to handle 2 simultaneous calls
- HD wideband audio and full-duplex speakerphone with advanced acoustic echo cancellation
- 128x32 graphical LCD with support for multiple languages
- Broad interoperability with most of the leading IP PBX, Softswitch platforms and 3rd party SIP devices and can be easily auto provisioned for mass deployment
- Protocol/standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP, ARP/RARP, ICMP, DNS (A record and SRV), DHCP, PPPoE, TFTP, NTP, STUN, SIMPLE
- Feature keys: 3 dynamic context sensitive soft keys, 3 navigation/menu/volume keys, 7 dedicated function keys for: HOLD, SPEAKERPHONE, SEND, TRANSFER, CONFERENCE, FLASH and HEADSET
- Support for G.723.1, G.729 A/B, G.711 u/a-law, G.726, G.722 (wide-band), GSM and iLBC, in
- band and out-of-band DTMF (in audio, RFC2833, SIP INFO)
- Hold, Mute, Transfer, Forward, 3-way Conference, Downloadable Phone Book (XML, LDAP up to 200 items), Call Waiting, Call Log, Off-hook Auto Dial, Auto Answer, Click-To-Dial, Downloadable Ringtones, Server Redundancy and Fail-over Support
- 2.5mm and RJ9 headset jack
- Layer 2 (802.1Q, 801.2p) and Layer 3 (ToS, DiffServ, MPLS) QoS
- User and administrator level passwords, MD5 and MD5
- sess based authentication, AES based secure configuration file, SRTP
- Firmware upgrade via TFTP/HTTP, mass deployment using central secure provisioning file
- Integrated (IEEE 802.3af) PoE
- Universal power adaptor (Input: 100-240VAC 50-60Hz, Output:+5VDC, 1.2A, UL Certified) included
- GXP280
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