View the updated version of this article on the new Retreaver support site
https://learn.retreaver.com/guides/how-uk-toll-free-calls-are-forwarded-to-us-numbers
If you are trying to send a UK caller ID to a US Toll-free number, we have to obfuscate to the 881 area code otherwise the business rules of US Toll-free numbers won’t let the call through. You can either try to obtain numbers that are Local US, Local UK, or SIP to route calls to.
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