We have a Siemens Hipath 1120 V7 PBX with a UP/0 extention module, Fax/DID Module and 2 analog trunk lines.
Once in each 6~8 weeks the PBX gets hung up and it is not possible to call anymore. There is no dial tone at that time and the red LED on the PBX itself is turned off.
After a mains...
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