IP Phone-Grandstream GXP2135

The GXP2135 is an enterprise-grade IP phone that supports Gigabit speeds and up to 32 virtual BLF/speed-dial keys, making it ideal for busy workers. This Enterprise IP Phone features up to 8 lines/line keys and 4 SIP accounts using a 2.8 inch (320 x 240) color display LCD and full HD audio. The GXP2135 includes up to 32 digital, on-screen speed dial/BLF keys to help users be more productive and efficient. This Enterprise IP Phone supports the fastest possible connection speeds with dual Gigabit network ports, features integrated PoE and includes built-in Bluetooth for syncing with mobile devices and Bluetooth headsets. The GXP2135 is the perfect choice for business users looking for a powerful and reliable IP phone with advanced functionality


  • Gigabit


    Dual switched auto-sensing 10/100/1000Mbps Gigabit network ports

  • Dial Keys

    Dial Keys

    32 digitally programmable & customizable BLF/fastdial keys

  • Bluetooth


    Built-in Bluetooth for syncing headsets and mobile devices for contact books, calendars & call transferring

  • HD Audio

    HD Audio

    HD audio to maximize audio quality and clarity; full duplexspeakerphone

  • POE


    Built-in PoE to power the devices and give it a network connection

  • EHS Headsets

    EHS Headsets

    Supports EHS compatible Plantronics’s headsets

  • Automated provisioning

    Automated provisioning

    Automated provisioning using TR069 or AES encrypted XML configuration file

  • Security


    TLS and SRTP security encryption technology to protect calls and accounts

  • Audio Conferencing

    Audio Conferencing

    4-way audio conferencing for easy conference calls

  • Zero Config

    Zero Config

    Use with Grandstream’s UCM series IP PBX appliance for ZeroConfig provisioning, 1-touch call recording & more

  • 8 Lines

    8 Lines

    8 lines, 8 dual-color line keys (with 4 SIP accounts), 4 XML programmable contextsensitive soft keys

Technical Specification

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
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
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)
HD audio
Yes, HD handset and speakerphone with support for wideband audio
Base Stand
Yes, 2 angle positions available, Wall Mountable
Layer 2 QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS
User and administrator level passwords, MD5 and MD5-sess based
authentication, 256-bit AES encrypted configuration file, SRTP, TLS, 802.1x media access control
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