If you want the Agent to end call, go to tools > create tool, choose end call. If it is created, got the assistant you want to end the call, click on tools> scroll down, find tools, then select the tool you created. Then go to the prompt of the assistant and place this - Trigger the "end_call_tool" tool in place where you want the assistant to end the call. Please remember to update "end_call_tool" to match the name of the tool you created