hi
Not all E1 providers have crc4 turned on.
Except for ISDN lines, E1s hardly ever have CRC4 turned on. As you
said, some countries don't even turn it on for ISDN, which is stupid.
It is a historic reason for this cause the first E1/ISDN connections
where on computers that did not have sufficient CPU power to maintain
CRC, meaning that the standard leave this as optional. But, you can
usually get it switched on per line.
jvb
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