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GXP21XX User Guide 
Version 1.0.9.108 
 
Table 7: GXP2135 Technical Specifications 
SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, FTP/FTPS, ARP, ICMP, 
DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, 
LLDP, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6 
Dual  switched  auto-sensing  10/100/1000  Mbps  Gigabit  Ethernet  ports  with 
integrated PoE 
2.8 inch (320x240) TFT color LCD 
8 line keys with up to 4 SIP accounts or 32 provisionable BLF/fast-dial keys, 4 
programmable contexts sensitive softkeys, 5 navigation/menu keys, 11 dedicated 
function keys for: MESSAGE (with LED indicator), PHONEBOOK, TRANSFER, 
CONFERENCE, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, 
VOLUME+, VOLUME - 
Support for G.729A/B, G.711µ/a-law, G.726, G.722 (wide-band), in-band and out-
of-band DTMF (in audio, RFC2833, SIP INFO) 
RJ9 headset jack (allowing EHS with Plantronics headsets) 
Hold,  transfer,  forward,  4-way  conference,  call  park,  call  pickup,  shared-call-
appearance  (SCA)/bridged-line-appearance  (BLA),  downloadable  phonebook 
(XML,  LDAP,  up  to  2000  items),  call  waiting,  call  log  (up  to  500  records), 
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 
Weather, GMI available for advanced custom application development 
Yes, both on handset and full-duplex handsfree speakerphone 
Base Stand / Wall 
Mountable 
Yes, allow 2 angle positions 
Layer 2 (808.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS 
User  and  administrator  level  passwords,  MD5  and  MD5-sess  based 
authentication, AES based secure configuration file, SRTP, TLS, 802.1x media 
access control 
English,  Arabic,  Chinese,  Croatian,  Czech,  Dutch,  German,  French,  Hebrew, 
Hungarian,  Italian,  Japanese,  Korean,  Polish,  Portuguese,  Russian,  Slovenia, 
Spanish, Turkish , Catalan 
Firmware upgrade via TFTP/HTTP/HTTPS/FTP/FTPS, mass provisioning using 
TR-069 or encrypted XML configuration file 
Power & Green 
Energy Efficiency 
Universal power adapter included: Input:100-240VAC; Output: +12VDC, 0.5A; 
Integrated Power-over-Ethernet (802.3af) 
Max power consumption 3W