Grandstream Networks user manual GXP-2020 Technical Specifications

Table 4: GXP-2020 Technical Specifications

Lines	6 direct lines with independent SIP accounts, 7 programmable speed dial keys
	4 XML programmable soft-keys
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 320 X 160 pixels graphic LCD

Feature Keys 11 dedicated keys: hold, send, speakerphone, headset, transfer, conference (up to

5parties), mute, message, Do-Not-Disturb (DND), phone book, intercom/paging, 5 display/menu navigation keys, dual color (g/r) LEDs

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)
	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
Telephony	Intuitive graphic user interface (GUI), downloadable phone book (XML, LDAP),
Features	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 plans, off-hook auto dial, auto answer, early
	dial and speed dial
Network and	Via keypad/LCD, Web browser, or secure (AES encrypted) central configuration file,
Provisioning	manual or dynamic host configuration protocol (DHCP) network setup
	Support NAT traversal using IETF STUN and Symmetric RTP
	Support for IEEE 802.1p/Q tagging (VLAN), Layer 3 TOS
Firmware	Support firmware upgrade via TFTP or HTTP,
Upgrades	Support for Authenticating configuration file before accepting changes
	User specific URL for configuration file and firmware files
Advanced	Message waiting indication, support DNS SRV Look up and SIP Server Fail Over,
Server Features	Support customizable idle screen via downloading XML by HTTP/TFTP
Security	DIGEST authentication and encryption using MD5 and MD5-sess, SRTP, SIP over
	TLS (pending)
Grandstream Networks, Inc.		GXP–2020 Users Manual	Page 10 of 33
		Firmware 1.1.4.3	Last Updated: 05/2007