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Grandstream Networks, Inc. GXP User Manual Page 11 of 44
Firmware 1.2.5.3 Last Updated: 03/2011
Table 7: GXP Technical Specifications
Lines
Multiple direct lines with independent SIP accounts, programmable speed dial keys,
XML programmable soft-keys (non programmable on GXP-280/285, GXP1200, GXP2000).
Protocol
Support
Support SIP 2.0, TCP/UDP/IP, PPPoE, RTP/RTCP, SRTP by SDES, HTTP, ARP/RARP,
ICMP, DNS, DHCP, NTP, TFTP, SIMPLE/PRESENCE protocols
Supports multiple SIP accounts
Supports SIP PUBLISH method (RFC 3903), SIP Presence package (RFC 3856, 3863) for
use of 7 MFKs, SIP Dialog package (RFC 4235)
Supports SIP MESSAGE method (RFC 3428)
Stores up to 100 incoming IM messages
Display
Back-lit graphic LCD display. (GXP-280/285 display is not back-lit)
Feature
Keys
GXP-280/285 GXP-1200 GXP-2000 GXP-2010 GXP-2020
HOLD Yes Yes Yes Yes Yes
SPEAKERPHONE Yes Yes Yes Yes Yes
SEND Yes Yes Yes Yes Yes
TRANSFER Yes Yes Yes Yes Yes
CONF Yes Yes Yes Yes Yes
MUTE Yes Yes Yes Yes Yes
DND Yes Yes Yes Yes Yes
HEADSET Yes Yes Yes Yes Yes
INTERCOM No No No Yes Yes
PHONEBOOK No No No Yes Yes
MSG Yes Yes Yes Yes Yes
MENU Yes Yes Yes Yes Yes
NAVIGATION (4) Yes (3) Yes Yes Yes Yes
Device
Management
NAT-
friendly remote software upgrade (via TFTP/HTTP) for deployed devices including
behind firewall/NAT
Auto/manual provisioning system, GUI Interface
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)
Expansion interface, Address Book
Audio
Features
Full-duplex hands-free speakerphone, headset enabled
Advanced Digital Signal Processing (DSP)
Dynamic negotiation of codec and voice payload length
Support for G.723,1 (5.3/6.3K), G.729A/B, G.711 a/µ-law, G.726-32, G.722 (wide-band),
GSM and iLBC codecs
In-band and out-of-band DTMF (in audio, RFC2833, SIP INFO)
Silence Suppression, VAD (voice activity detection), CNG (comfort noise generation), AGC
(automatic gain control)
Acoustic Echo Cancellation (AEC) with Automatic Gain Control (AGC) for speakerphone
mode, Support side tone
Adaptive jitter buffer control and packet delay & loss concealment
Telephony
Features
Intuitive graphic user interface (GUI), downloadable phone book (XML, LDAP), support for
anonymous call using privacy header, MLS (multi language support)
Voice mail indicator, downloadable custom ring-
tones, call hold, call transfer