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sforce.opencti.enableClickToDial() method can be used for Salesforce Lightning Experience Open CTI Click to Dial.
Sample Code:
let callbackFunc = function( response ) {
console.log(
'Response Success value is',
response.success
);
if ( response.success ) {
console.log(
'returnValue:',
response.returnValue
);
} else {
console.error(
'Errors:',
response.errors
);
}
};
sforce.opencti.enableClickToDial( {
callback: callbackFunc
} );
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Reference Article: