Paul Hales wrote:
I am setting up an E1 crossover system for a customer, with a Siemens
Hipath Officecom 150 system.

And it's not working - I get a red alarm from the outside world, and a
yellow from the PABX.
What's your zaptel.conf?

My suggestion:
a. Do one step at a time.
b. Asterisk - PBX: use a cross-cable. You probably need to enable CRC on the span. You need to take timing from the span connected to the telco. c. Asterisk - PSTN: should be straight cable. You need to take timing from the PSTN. Red alarm means not connected.

Hope this helps.

Leo

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