Grandstream Networks GXP21 Series User Manual page 11

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 Via keypad/LCD, Web browser, or secure (AES encrypted) central configuration file,
manual or dynamic host configuration protocol (DHCP) network setup
Provisioning
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 User and administrator level passwords, MD5 and MD5-sess based
authentication, AES based secure configuration file, SRTP, TLS, 802.1x
media access control
Grandstream Networks, Inc. GXP21xx User Manual
Firmware 1.0.1.26
Page 11 of 42
Last Updated: 11/2010