Grandstream GXP2135 Enterprise IP Telephone 8 Line 4 SIP Accounts [GXP2135]

Security

User and administrator level passwords, MD5 and MD5-sess based
authentication, 256-bit AES encrypted configuration file, SRTP, TLS, 802.1x
media access control

Specifications

Protocols/Standards
SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS (A record,
SRV, NAPTR), DHCP, PPPoE, SSH, TELNET, TFTP, NTP, STUN, SIMPLE, LLDP,
LDAP, TR-069, 802.1x, TLS, SRTP, IPV6, CDP/SNMP/RTCP-XR

Network Interfaces 
Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with
integrated PoE

Graphic Display 
2.8 inch (320x240) TFT color LCD

Bluetooth 
Yes, integrated

Feature Keys
8 line keys with up to 4 SIP accounts, 4 XML programmable context sensitive
softkeys, 5 navigation/menu keys, 11 dedicated function keys for :
MESSAGE (with LED indicator), PHONEBOOK, TRANSFER, CONFERENCE,
HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOL+, 

Voice Codec
Support for G.729A/B, G.711µ/a-law, G.726, G.722(wide-band),G723.1, iLBC,
Opus, in-band and out-of-band DTMF (in audio, RFC2833, SIP INFO), VAD,
CNG, AEC, PLC, AJB, AGC

Auxiliary Ports 
RJ9 headset jack (allowing EHS with Plantronics headsets)

Telephony Features
Hold, transfer, forward, 4-way conference, call park, call pickup, shared-callappearance (SCA)/bridged-line-appearance(BLA), downloadable phonebook
(XML, LDAP, up to 2000 items), call waiting, call log (up to 500 records), XML
customization of screen, off-hook auto dial, auto answer, click-to-dial, flexible
dial plan, hot desking, personalized music ringtones and music on hold,
server redundancy and fail-over

HD audio 
Yes, HD handset and speakerphone with support for wideband audio

Base Stand 
Yes, 2 angle positions available, Wall Mountable

QoS 
Layer 2 QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS

Multi-language 
English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, simplified and traditional Chinese, Korean, Japanese and more

Upgrade/Provisioning Firmware upgrade via TFTP / HTTP / HTTPS, mass provisioning using TR-069
or AES encrypted XML configuration file, FTP/FTPS

Power & Green Energy Efficiency
Universal power adapter included:Input:100-240V ; Output: +12V, 0.5A ;
Integrated Power-over-Ethernet (802.3af)
Max power consumption : 6.4W (power adapter) or 6.49W (PoE)

Physical Dimension: 201mm(W) x 193mm(L) x 85mm(H); Unit weight:0.85kg ; Package
weight:1.12kg

Temperature and Humidity
Operation: 0°C to 40°C
Storage: -10°C to 60°C
Humidity: 10% to 90% Non-condensing