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Grandstream Networks, Inc. GXP21xx User Manual Page 10 of 48
Firmware version: 1.0.1.110 Last Updated: 01/2012
concealment
HD audio handset with HD wideband audio codecs for excellent double-talk
performance
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
(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, dial-plan support, off-hook
auto dial, auto answer, early dial and speed dial
Network and
Provisioning
Via keypad/LCD, Web browser, or secure (AES encrypted) central
configuration file, manual or dynamic host configuration protocol (DHCP)
network setup
Support NAT traversal using IETF STUN and Symmetric RTP
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ,
MPLS)
Firmware Upgrades
Support firmware upgrade via TFTP or HTTP
Support for Authenticating configuration file before accepting changes
User specific URL for configuration file and firmware files
Mass provisioning using TR-069 or encrypted XML configuration file
Advanced Server
Features
Message waiting indication, support DNS SRV Look up and SIP Server Fail
Over, Support customizable idle screen via downloading XML by HTTP/TFTP
Security User and administrator level passwords, MD5 and MD5-sess based
authentication, AES based secure configuration file, SRTP, TLS, 802.1x
media access control
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