1. Use the following SOQL to get the CallCenterId.

SELECT Id, Name
FROM CallCenter

2. Use the following Apex code to create the VoiceCall record.

Sample Apex Code:

insert new VoiceCall(
    CallCenterId = '<Id of Contact Center>', 
    VendorType = 'ContactCenter', 
    CallType = 'Inbound',
    FromPhoneNumber = '+19999999999', 
    ToPhoneNumber = '+19999999999',
    CallStartDateTime = System.now().addMinutes( - 3 ),
    CallEndDateTime = System.now(),
    CallDisposition = 'completed'
);

Sample Apex Code:

public with sharing class VoiceUtility {
    
    public static void createVoiceCall(
    	String callCenterName
    ) {
	
		List < CallCenter > listCallCenters = [
            SELECT Id
            FROM CallCenter
            WHERE Name =: callCenterName
        ];
        CallCenter objCC = 
            listCallCenters.size() > 0 ?
            listCallCenters.get( 0 ) :
        	null;
        
        insert new VoiceCall(
            CallCenterId = objCC != null ? objCC.Id : null, 
            VendorType = 'ContactCenter', 
            CallType = 'Inbound',
            FromPhoneNumber = '+19999999999', 
            ToPhoneNumber = '+19999999999',
            CallStartDateTime = System.now().addMinutes( - 3 ),
            CallEndDateTime = System.now(),
            CallDisposition = 'completed'
        );
        
    }
    
}

Sample Apex Code to execute the Utility Class and Method:

VoiceUtility.createVoiceCall(
    'InfallibleTechVoice'
);

Test Class for VoiceUtility:

@isTest
public class VoiceUtilityTest {
    
    static testMethod void testGet() {
        
        VoiceUtility.createVoiceCall(
        	'Testing'
        );
        
    }
    
}