How do I obtain from the API the forwarding number list from the API?
According to the documentation these are the acceptable "from" number for the first leg of a RingOut call.
The RingOut Service makes these numbers available.
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In order to do it you can call
GET /restapi/v1.0/account/~/extension/~/forwarded-number
You can check here: https://developers.ringcentral.com/guide/basics/configuration/account_extension
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