AX-4T AX-4T is a Quad-Span E1 half-length PCI card which supports both telephony and data modes. AX-4T has four E1/PRI interfaces supporting PRA signalling, HDLC,  PPP and Frame Relay data modes, and any combination thereof. With AX-4T, you can easily build your IP-PBX or Carrier system with handling 124 channels/calls Features | Specifications | Packing 1. Same as Tormenta2 and Digium’s E400P cards, 2. Provide four E1/PRI interface for to 124 channels/calls 3. Supports standard telephony and data protocols. (Including RBS and PRI protocol families for voice and PPP, Cisco HDLC and Frame Relay data modes). 4. 100% compatible Asterisk PBX all features. 5. Support SS7 (through chan_ss7) 6. Be used for VoIP/Call Center/PBX Applications: 1. PBX/IVR Services 2. VoIP Services 3. VoIP Gateways 4. FAX Server, FAX On Demand 5. Voice Mail Services 6. Call Centers 7. Prepaid Calling Card System 8. Callback Service 9. Traditional Calls/VoIP Calls Conference Data Modes:     Cisco HDLC     HDLC     PPP     Multilink PPP     Frame Relay     Voice Modes:     PRI CPE & PRI NET: -NI1 -NI2 -EuroISDN -4ESS(AT&T) -5ESS(Lucent) -DMS100   E&M: -Wink -Feature Group B -Feature Group D    FXO & FXS -Ground Start -Loop Start -Loop Start with Disconnect Detect Interfaces:     4 X T1 interfaces     PCI 5.0V interface AX-4E Four E1 PCI card X 1