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Grandstream

Hold, transfer, forward (unconditional/no-answer/busy), call park/pickup, 4-way
conference, shared-call-appearance (SCA) / bridged-line-appearance (BLA), downloadable
phone book (XML, LDAP, up to 500 items), call waiting, call history (up to
200 records), off-hook auto dial, auto answer, click-to-dial, flexible dial plan, hot
desking, personalized music ringtones, server redundancy & fail-over

User and administrator level access control, MD5 and MD5-sess based authentication, 256-bit AES encrypted configuration file, TLS, SRTP, HTTPS, 802.1x media
access control

3 line keys with dual-color LED and 3 SIP accounts, 3 XML programmable context
sensitive soft keys, 5 (navigation, menu) keys, 8 BLF keys, 13 dedicated function
keys for MUTE, HEADSET, TRANSFER, CONFERENCE, SEND and REDIAL, SPEAKERPHONE, VOLUME, PHONEBOOK, MESSAGE, HOLD, PAGE/INTERCOM, RECORD, HOME

Yes, HD handset and speakerphone with support for wideband audio

English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, simplified and traditional Chinese, Korean, Japanese and more

g Firmware upgrade via TFTP / HTTP / HTTPS, mass provisioning using TR-069 or AES encrypted XML configuration file

GXP 1630