Siemens Hipath 3800 Programming Manual -

The manual excels in its ISDN (PRI/BRI) debugging sections. It provides exhaustive lists of cause codes, layer 2/layer 3 traces, and interpretation guides. For any tech dealing with failed E1/T1 trunks or QSIG interconnects, this manual is worth its weight in gold.

The manual contains extensive lists of FACs. For example: siemens hipath 3800 programming manual

These can be changed system-wide.

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