15 concurrent calls and up to 30 registersHD voice codec G.722 for perfect voice qualityFax to Email and Email to Fax for green officeVoicemail to Email for not missing any important messagePaging and intercom function strengthens the work efficiencyBuilt-in SIP Proxy Server following RFC 3261Multiple Languages of GUI for international businessWeb-based Control Panel for easy configuration and management of the systemHardware Echo Cancellation module for great and smooth communicationStrong security features protect your system from hackingSupports 2 FXO interfacesRecords voice and voicemail to external USB disk Quick Setup Wizard Codec and ProtocolSIP 2.0 (RFC3261),IAX and Lync server compliantAudio Codec: G.711-Ulaw, G.711-Alaw, G.722, G.726, G.729, GSM, Speex and Opus Video Codec: H.261, H.263, H.263+, H.264 and VP8DTMF: RFC 4733, SIP info, in-band and autoNetwork and Security FeaturesDHCP Server, DDNS Client (PLANET DDNS & Easy DDNS)SNMP v1/v2, IEEE802.1Q of VLANIPv4/IPv6, TR069Manual Configuration of Static Route TableTroubleshooting (Ping, Traceroute)VPN Server, VPN ClientRefuse SIP Register DoS, Refuse Abort Invite DoSRefuse SSH Login DoSFirewall and enhances https connection PBX FeaturesSIP Register with UDP/TCP/TLSOne Touch RecordingMobility ExtensionBlack ListBLF (Busy Lamp Field)CDR (Call Detailed Record)Conference Room DID (Direct Inward Dialing Number)SRTP (Secure Realtime Transport Protocol)DND (Do Not Disturb)IVR (Interactive Voice Responses)Follow Me, Call Spy and PIN SetDistinctive RingtoneMulti-language System PromptPhone Book, Speed DialRing Group, SIP TrunkSkype for SIP, Smart DID, System LogT.38 fax (pass-through), voicemail and voicemail to e-mail Call FeaturesCall Back, Call Forward, Call GroupCall Hold, Call Paging and IntercomCall Park, Call Pickup, Call QueueCall Record, Call Route, Blind Transfer Attend Transfer, Call WaitingCaller ID, Dial by Name Customized IVR, On-hold Music, Transfer Three-way Conferencing, Video Call