Goal (short description)
Goal of this HOWTO is to configure VoIP gateway between SIP and E1 using opensource PBX Asterisk.
Applicability
It is applicable for:
- VoIP provider who wants to offer services for customers unsing EuroISDN PRI as conectivity to PSTN
- Organisation whichs want to connect their existing PBX with EuroISDN PRI or QSIG port(s) to SIP provider
- Organisation which wants to interconect two existing PBXes with EuroISDN PRI or QSIG connectivity using IP and SIP
Prerequisites (OS, dependencies on other software)
- Server with some linux distribution
- ISDN30 PCI card inside this server
- PBX with EuroISDN or QSIG connectivity or EuroISDN PRI connectivity to PSTN
Configuration (OS agnostic)
Install Asterisk
First it is needed to install Asterisk. In most distributions, this should be easy because Asterisk is packaged with your distro. So use your distribution package manager to install. This howto is not made to focus on installation step.
Install HW drivers
You have to be sure that drivers for your ISDN PRI card are working. Simplest way is probably to install zaptel drivers (or it is together with your Asterisk package from your distro).
Ensure that hardware is working
If your hardware is working, you should be able to see something like:
cat /proc/zaptel/1 Span 1: WCT1/0 Digium Wildcard TE110P T1/E1 Card 0 HDB3/CCS/CRC4 ...
Please ensure that /proc/zaptel exists and that there are enaught rights to /dev/zap/* for your asterisk process.
Configure Layer1 and Layer2 parameters
This parameters are setuped by /etc/zaptel.conf (change xx to your country code (eg. uk or de). Disable crc4 if your operator or PBX does not support it.
loadzone = xx defaultzone = xx # PRI TE span=1,0,0,ccs,hdb3,crc4 bchan=1-15 dchan=16 bchan=17-30