MyPBX U500 (IP PBX for Your Business)      MyPBX U500 is intended for offices of up to 500 users, offering 16 phone ports for FXO, FXS, GSM, UMTS, ISDN BRI connectivity. It supports up to 80 concurrent calls. The connection to traditional network allows company to protect their previous investment while taking advantage of cost savings and the full complement of VoIP features and being able to nimbly respond to growth and updates. Support 500 Users Support 80 Concurrent Calls Up to 16 Analog Ports Up to 8 GSM/UMTS Ports Up to 8 BRI Ports One RS232 Port Support Call Recording Features Attend Transfer Blind Transfer BLF Support Blacklist CDR (Call Detail Records) Call Forward Call Parking Call Pickup Call Routing Call Transfer Call Waiting Caller ID Conference Define Office Time Dial by Name DISA (Direct Inward System Access) DIDs Distinctive Ringtone DND (Do Not Disturb) Firewall Follow Me IVR (Interactive Voice Response) Intercom/Zone Intercom Multi-language Prompt Music On Hold Music On Transfer MyTwins (Double System) One touch record Phone Provisioning PIN User (PIN Code Control) Paging/Zone Paging Queue Ring Group  Route by Caller ID Skype Integration (Skype Connect) Speed Dial Three Way Calling Voicemail Voicemail to Email Voicemail Forwarding Web Based Control Panel Spy functions (Normal Spy, Whisper Spy, Barge Spy) Specification Users: 500 Concurrent Calls(Max): 80 Voicemail: 3000min (upgradable) Auto-Recording(Add-on): Support Hard Disk: Support 2.5 inch SATA2 (Optional) Interface: Up to 16 Analog Ports (FXO/FXS) Up to 8 GSM Ports (850/900/1800/1900MHz) Up to 8 UMTS Ports (900/2100 or 850/2100MHz) Up to 8 BRI Ports One RS232 Port LAN: 1 (10/100Mbps) WAN: 1 (10/100Mbps) USB: 1 (USB2.0) Audio In/Out: Supported Size: 438x280x44 mm (1U Rack-Mount) Weight: 3.4kg Power Supply: AC100-240V 50/60Hz (15A MAX) Protocol: SIP(RFC3261), IAX2 Transport Protocol: UDP,TCP,TLS, SRTP Codec: G711, GSM, SPEEX, G722, G726, G729A, ADPCM, H261, H263, H263p, H264, MPEG4. DTMF: Inband, RFC2833, SIP INFO Echo Cancellation: Supported LED: Red for FXO/GSM/UMTS, Orange for BRI, Green for FXS. Network: Static IP, PPPoE, DHCP, Firewall, VLAN, DDNS, QoS, DHCP Server, OpenVPN Multiple Languages Support: Chinese, Dutch, English, French, German, Hebrew, Korean, Italian, Polish, Portuguese, Romanian, Russian, Spanish, Thai, Turkish Internal Construction