A PBX is only really useful if you can get calls into it. Of course, you can use Asterisk with VoIP calls (SIP, H.323, IAX), but you can also talk to the real PSTN through various cards. Supported Hardware is divided into two general groups: Zaptel devices and non-zaptel devices. The Zaptel compatible hardware supports pseudo-TDM conferencing and all call features through chan_zap, whereas non-zaptel compatible hardware may have different features. Zaptel compatible hardware ========================== -- Digium (Primary author of Asterisk) http://www.digium.com, http://store.yahoo.com/asteriskpbx * Wildcard X100P - Single FXO interface connects to Loopstart phone line * Wildcard T400P (obsolete) - Quad T1 interface connects to four T1/PRI interfaces. Supports RBS and PRI voice and PPP, FR, and HDLC data. * Wildcard E400P (obsolete)- Quad E1 interface connects to four E1/PRI (or PRA) interfaces. Supports PRA/PRI, EuroISDN voice and data. * Wildcard T100P - Single T1 interface connects to a single T1/PRI interface. Supports RBS and PRI voice and PPP, FR, and HDLC data. * Wildcard E100P - Single E1 interface connects to a single E1/PRI (or PRA) interface. Supports PRA/PRI, EuroISDN voice and PPP, FR, HDLC data. * Wildcard S100U - Single FXS interface connects to a standard analog telephone. * Wildcard TDM400P - Quad Modular FXS interface connects to standard analog telephones. * Wildcard TE410P - Quad T1/E1 switchable interface. Supports PRI and RBS signalling, as well as PPP, FR, and HDLC data modes. Non-zaptel compatible hardware ============================== -- QuickNet, Inc. http://www.quicknet.net * Internet PhoneJack - Single FXS interface. Supports Linux telephony interface. DSP compression built-in. * Internet LineJack - Single FXS or FXO interface. Supports Linux telephony interface. Miscellaneous other interfaces ============================== -- ISDN4Linux http://www.isdn4linux.de/ * Any ISDN terminal adapter supported by isdn4linux should provide connectivity. -- ALSA http://www.alsa-project.org * Any ALSA compatible full-duplex sound card -- OSS http://www.opensound.com * Any OSS compatible full-duplex sound card