The setup with the old (legacy) call center adapter is explained here. The adapter is no longer supported. All newer configuration options will only be available in the extended call center configuration.
Die CTI Adapter URL starting from 5.6 onwards is always
/apex/Mirage__mirageSystemsOpenCTI
for all instances (including Sandbox
The Mirage Cloud Service URL determines the data center. You should reconfigure the default settings.
Do not change any configuration but the Mirage Cloud Service URL should be changed.
The detail call center configuration is done using the sections below in the adapter