I have had a similar Use-Case before. To make phone calls i would recommend that you use Email to Phone Call providers. such as Emailtovoice or Zapier. Essentially the provider will be in a listening state and the second it receives a specific email it will trigger a phone call. In the playbook use EWS-Send email or any other email integration to send the email to the listener. As far as I know the XSOAR does not have any in-built function or external integration for this. We wanted to send a whatsapp message automatically however the Twilio integration does not provide this capability + Twilio had a major breach recently.
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