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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

bearerIncompatibility(75)

Check the span parameters config. Try setting AT*V2 to "0" for universal connect. If this is already set, or does not work contact your telco. 3COM suggests that the following may be the reasons for a telco failure (Q931 reasons):

Unassigned number
No user responding
Call rejected
Service not available
Capability not implemented
Bearer capability not available
Incomplete destination
Interworking unspecified