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Goal of this HOWTO is to configure VoIP gateway between SIP and ISDN3 E1 using opensource PBX Asterisk. 

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• VoIP provider who wants to offer services for customers unsing ISDN30 EuroISDN PRI as conectivity to PSTN
• Organisation whichs want to connect their existing PBX with ISDN30 EuroISDN PRI or QSIG port(s) to SIP provider
• Organisation which wants to interconect two existing PBXes with ISDN30 EuroISDN PRI or QSIG connectivity using IP and SIP

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• Server with some linux distribution
• ISDN30 PCI card inside this server
• PBX with IDN30 EuroISDN or QSIG connectivity or ISDN30 EuroISDN PRI connectivity to PSTNSIP phones

Configuration (OS agnostic)

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