@Vadim Cool Thanks for your patience on this. I have checked with ACS engineering team and sharing the below.
Unfortunately, spoofing method for phone number is not supported in ACS at this moment but team has confirmed that this feature is present in our product roadmap, and they don't have any ETA at this moment.
I would suggest you follow the latest updates related to ACS here.
Hope this helps! Let me know if you have any further question son this.
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