In the Ringostat Personal Account, we go to the "Script substitution" page -> "User JS functions", select the call moment and add an event dispatch to the data layer:
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dataLayer.push({'event': 'beforeCall'});
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In the GTM interface, we create an activation trigger with the "User Event" type and specify the event name from the data layer:

We go to the tags section and create a new tag, specifying the following data:
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Tag type - Google Analytics: Google Analytics 4 event;

Metric identifier - specify the Measurement ID (GA4 counter identifier);

Event name - we name the event the same as the trigger (for example, beforeCall);

Activation trigger - previously created trigger "Before the call";
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