Grandstream Networks GXP Series Protocol, Support, Display, Feature Keys, Device, Management

Lines Multiple direct lines with independent SIP accounts, programmable speed dial keys,

XML programmable soft-keys. (except on GXP-280)

Protocol	Support SIP 2.0, TCP/UDP/IP, PPPoE, RTP/RTCP, SRTP by SDES, HTTP,
Support	ARP/RARP, ICMP, DNS, DHCP, NTP/SNTP, TFTP, SIMPLE/PRESENCE protocols
	Support multiple SIP accounts and up to 11 media channels concurrently
	Support SIP PUBLISH method (RFC 3903), SIP Presence package (RFC 3856,
	3863) for use of 7 MFKs, SIP Dialog package (RFC 4235)
	Support for SIP MESSAGE method (RFC 3428)
	Stores up to 100 incoming IM messages (drops IM message 101 plus)
Display	Back-lit graphic LCD display. (GXP-280 display is not back-lit)
Feature Keys
		GXP-280	GXP-	GXP-2000	GXP-2010	GXP-2020
			1200
	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	NAT-friendly remote	software	upgrade	(via TFTP/HTTP) for deployed devices
Management	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)

Telephony Features

Silence Suppression, VAD (voice activity detection), CNG (comfort noise generation), ANG (automatic gain control)

Acoustic Echo Cancellation (AEC) with Acoustic Gain Control (AGC) for speakerphone mode, Support side tone

Adaptive jitter buffer control (patent-pending) and packet delay & loss concealment

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 (attended/blind), call forward, call waiting, caller ID, mute, redial, call log, caller ID display or block, Do-Not-Disturb (DND) and volume control

Multi-party conferencing (up to 5), dial plan prefix, off-hook auto dial, auto answer, early dial and speed dial (on some models)

Grandstream Networks, Inc.	GXP User Manual	Page 11 of 40
	Firmware 1.1.6.16	Last Updated: 05/2008