User manual

Release 2.2 Digium, Inc. Page 49
Chapter 4: Troubleshooting
I am still having problems and the telco tells me it is my equipment.
The first thing to do in this situation is to test your equipment.
1. Connect a loopback plug. (A loopback plug has pin 1 going to pin 4
and pin 2 going to pin 5.) Insert the plug into the span and wait for its
LED to turn green.
2. Stop Asterisk and edit zaptel.conf by removing the lines defined for
your card and replacing them with the following:
span=>1,0,0,esf,b8zs
clear=1-24
Or if you have an E1 span:
span=> 1,0,0,ccs,hdb3
clear=1-31