Hi,
Call flow:
PSTN > PRI > Hipath > BRI > Cisco router (CallManager Express) > BRI > Hipath > local phone
Siemens is rejecting the incoming call with Cause i = 0x859C - Invalid number format (incomplete number).
Below you can see the ISDN messages log from Cisco:
363865: Aug 7 15:50:52.279...
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