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IP PBXs USER MANUAL
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installed then you don’t have to configure module settings.
9.5.1 E1 PRI Signaling
E1 module can be installed on both Slot1 and Slot2. To ensure PBX-C302/PBX-C503 IPPBX can detect and drive E1 module in the Module
Type field you should choose “E1/T1”.

Mode
: Sets the module to work as E1 mode.
 Clocking Source : Use local or remote as the E1/T1 clock source.
 Signaling : Sets the module to work with PRI CPE or NET, CPE is used on the client side, NET is used on the telephony provider side.
 Framing : By default CPE and NET use CSS (Common Channel Signaling).
 Coding : By default HDB3.

CRC4
: A method of checking for errors in transmitted data on E-1 trunk lines. Enable it only if the telephony provider implemented
CRC4 on their E1 lines.
 Dial Plan : The ISDN-level Type Of Number (TON) or numbering plan, used for the dialed number. For most installations, leaving
this as 'unknown' (the default) works in the most cases. In some very unusual circumstances, you may need to set this to
'dynamic' or 'redundant'. Note that if you set one of the others, you will be unable to dial another class of numbers. For example,
if you set 'national', you will be unable to dial local or international numbers.
 Local Dial Plan : Only RARELY used for PRI (sets the calling number's numbering plan). In North America, the typical use is sending
the 10 digit callerID number and setting the prilocaldialplan to 'national' (the default). Only VERY rarely will you need to change
this.
These configuration parameters should be given by the telephony provider, please configure these parameters correctly according to
what they give to match the switching equipment being used by the telephony provider.
Once the configurations had been done, save and reboot the IPPBX system. In the meantime you attach the E1 line to the E1 interface.
After rebooting you should get LED indications with L1 red, L2 red, L3 off and L4 green of a successful PRI CPE connection. For more
details of the LED indications please check PBX-C302 and PBX-C503 chapter in the LED Indication section.
If in the deployment you got some else connection status you should check with the telephony provider to confirm the configuration
parameters. Or check with them if the line had been activated by them and ready for phone calls.