Call server URL at end of call

Im using a server endpoint but I only want it to be triggered at the end of the call, but when I look at my call log i see it being triggered multiple times during the call. How can I make it so that it only triggers at the end of the call? Also I've noticed that there is a ServerURL field in the advanced section of the assistant and also in the API Keys page. Do I only use the one in the assistant advanced section?
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