TSP Driver / Telephony Service Crashes When Accessed
If the TSP Driver has an unused NIC selected, it will crash the Telephony Service. This will affect the operation of iPECS CCS applications which rely on the TAPI.
You will need to access the TSP Driver Configuration, this can be found in
Control Panel 
Phone –> Phone and Modem Options –> Advanced
Ensure the NIC selected is the connected and tested NIC for the PBX subnet.
End of article.
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