Grandstream Networks GXP21 Series User Manual page 11

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SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, FTP/FTPS, ARP, ICMP,
Protocols/Standards DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE,
LLDP, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6
Network Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with
Interfaces integrated PoE
Graphic
4.3 inch (480×272) TFT color LCD
Display
Bluetooth Yes, Bluetooth V2.1
12 line keys with up to 6 SIP accounts or 48 provisionable BLF/fast-dial keys, 5
programmable contexts sensitive softkeys, 5 navigation/menu keys, 11 dedicated
Feature
function keys for: MESSAGE (with LED indicator), PHONEBOOK, TRANSFER,
Keys
CONFERENCE, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE,
VOLUME+, VOLUME –
Voice Support for G.729A/B, G.711µ/a-law, G.726, G.722 (wide-band), in-band and out-
Codec of-band DTMF (in audio, RFC2833, SIP INFO)
Auxiliary RJ9 headset jack (allowing EHS with Plantronics headsets), USB, extension
Ports module port
Hold, transfer, forward, 5-way conference, call park, call pickup, shared-call-
appearance (SCA)/bridged-line-appearance (BLA), downloadable phonebook
Telephony (XML, LDAP, up to 2000 items), call waiting, call log (up to 500 records),
Features 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
Sample
Weather, GMI available for advanced custom application development
Applications
HD
Yes, both on handset and full-duplex handsfree speakerphone
audio
Page 11
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