IP PBX With 100 user,20 line,1FXO
1)IPPBX 100 extension capability, support 21 current calling lines
2) 1 sip account

1) ADSL Connecting to ADSL enabled telephone line
2)support DHCP Static PPPoe
3)Protocol IEEE 802.11g/b
IP PBX Interface/Function  
   Standard Telephony Service Interface;SIP: IETF RFC 3261/2327/3323/2833  
               Up to 1 FXS port, RJ11  
               Up to 1 FXO port, RJ11  
               Voice Codec G.711 Mu/A, G.729AB, G.723  
               Echo Cancellation (EC)  
               Voice Activity Detection (VAD)  
               Comfort Noise Generaton (CNG)  
               Fax over IP (G.711 A)  
               POTS Failover during power failure (FXO <-> FXS)  
    Lifeline (Emergency numbers are automatically routed to FXO) 

               Support registered by up to 100 SIP clients  
               Support registering to up to 20 SIP servers.  
               DTMF Inband RFC2833  
               Support VoIP QoS with ToS mechanism  
               Support dialplan customization  
    Voicemail Support up to total 30 minutes long voicemail & 1 minute long for each