MyPBX U300 (IP PBX for Your Business)      MyPBX U300 boasts an embedded PRI (E1/T1/J1) port and 2 FXS ports in the one compact system, providing higher density trunking for offices using E1 PRI signaling. This system supports up to 300 users and 50 concurrent calls. Also it could be used as a gateway to legacy PBX systems in applications. Support 200 Users Support 50 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: 200 Concurrent Calls(Max): 50 Voicemail: 3000min (upgradable) Auto-Recording(Add-on): Support 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: 340x210x44 mm Weight: 2.1kg 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