Basic Features Support SIP 2.0 (RFC3261) and correlative RFCs Support IAX2 Supports 3 SIP line Codec: G.711A/u, G.7231 high/low, G.729a/b, G.722, G.726 Echo cancellation: G.168 Compliance in LEC, additional acoustic echo cancellation(AEC) can reach 96ms max filter length in hands-free mode Support Voice Gain Setting, VAD, CNG Full duplex hands-free speakerphone SIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer/ IP call DTMF: Support SIP info, DTMF Relay, RFC2833 Advanced Application Features Large dot matrix LCD display and softkeys make user easier to use Friendly graphic menu 2 headset interface ( 3.5mm Jack or RJ9 connector) 6 memory keys Multilanguage realizes localization SIP application: support call forward/ transfer (blind/attended/alert)/ holding/ waiting/ 3 way talking/ conference/ paging and intercom/ call park/ pickup/ join call/ redial and unredial/ click to dial/ vport/secondary dialing automatically/ push to talk Call control features: flexible dial map, hotline, empty calling no. reject service, black list for reject authenticated call, white list, limit call, no disturb, caller ID, CLIR (reject the anonymous call), CLIP (make a call with anonymous), Dial without register Incoming calls /outgoing calls / missing calls. Each support 100 records.

Support Phonebook 500 records Support SMS Support Memo Support alarm clock Support Speed dial Support XML Maintenance and Management Web, telnet and keypad management Management with different account right Upgrade firmware through POST mode Telnet remote management/ upload/download setting file Safe mode provide reliability Support Auto Provisioning (HTTP, FTP or TFTP) Support Syslog.