Grandstream Networks GXP21 Series User Manual page 7

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Voice Codec
Auxiliary Ports
Telephony Features
Sample Applications
HD audio
Extension Module
Base Stand
Wall Mountable
QoS
Security
Page 7
Support for G.723.1, G.729A/B, G.711µ/a-law, G.726, G.722
(wide-band), OPUS, iLBC and in-band and out-of-band DTMF
(in audio, RFC2833, SIP INFO)
RJ9 headset jack (allowing EHS with Plantronics headsets),
USB, extension module port
Hold, transfer, forward, 5-way conference, call park, call
pickup, shared-call-appearance (SCA)/bridged-line-
appearance (BLA), downloadable phonebook (XML, LDAP, up
to 2000 items), call waiting, call log (up to 500 records),
customization of screen, off-hook auto dial, auto answer, click-
to-dial, flexible dial plan, Hot Desking, personalized music
ringtones and music on hold, server redundancy and fail-over
Weather, GMI available for advanced custom application
development
Yes, both on handset and full-duplex handsfree speakerphone
Yes, can power up to 4 GXP2200EXT modules which features
a 128×384 graphic LCD, 20 quick-dial/BLF keys which dual-
color LED, 2 navigation keys, and less than 1.2W power
consumption per unit.
Yes, allow 2 angle positions
Yes
Layer 2 (808.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)
QoS
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
GRANDSTREAM NETWORKS