Yeastar Mypbx U100. - Users: 100- Concurrent Calls: 25- Voicemail: Default 3000min (upgradable)- Auto-recording(add-on): Support- Interface:- Up To 16 Analog Ports (fxo/fxs)- Up To 8 Gsm Ports (quad-band Gsm/gprs850/900/1800/1900mhz)- Up To 8 Umts Ports (umts 900/2100mhz Or 850/2100mhz Or 850/1900mhz)- Up To 8 Bri Ports- One Rs232 Port- Lan: 1 (10/100mbps)- Wan: 1 (10/100mbps)- Usb: 1 (usb2.0)- Audio In/out: Supported- Sip Protocol: Sip(rfc3261) Iax2- Transport Protocol: Udp Tcp Tls Srtp- Codec: G.711 Gsm Speex G.722 G.726 Adpcm G.729 A 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 - Attend Transfer- Blind Transfer- Blf Support- Blacklist- Callback- Cdr (call Detail Records)- Call Forward- Call Parking- Call Recording- Call Pickup- Call Routing- Call Transfer- Call Waiting- Caller Id- Conference- Define Office Time- Ddns- Dial By Name- Disa (direct Inward System Access)- Dids- Distinctive Ringtone -dnd (do Not Disturb)- Fax (t.38)- Firewall- Follow Me- Ivr (interactive Voice Response)- Intercom/zone Intercom- Mobility Extension- Multi-language Prompt- Music On Hold- Music On Transfer- Mytwins (double System)- One Touch Record- Openvpn- Phone Provisioning- Pin User ( Pin Code Control)- Paging/zone Paging- Pppoe- Queue- Redundancy- Ring Group- Route By Caller Id- Skype Integration (skype Connect)- Sms To Mail/mail To Sms- Speed Dial- Three Way Calling- Voicemail- Voicemail To Email- Voicemail Forwarding- Web Based Control Panel- Spy Functions (normal Spy Whisper Spy Barge Spy)