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alan-kimelman-md8019 avatar image
alan-kimelman-md8019 asked Tyler Liu answered

"message" : "Parameter [to] value is invalid" in curl fax

When I attempt to curl with:


curl -i "

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Tyler Liu answered
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Up to 8 attachments (including images) can be used with a maximum of 1.0 MiB each and 10.0 MiB total.

Developer sandbox tools

Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.

Download RingCentral Phone for Desktop:

Tip: switch to the "sandbox mode" before logging in the app:

  • On MacOS: press "fn + command + f2" keys
  • On Windows: press "Ctrl + F2" keys