SMS Send POST with a secondary from

Our dialpad users have multiple phone numbers.

When we try to send a SMS message using the Dialpad SMS Send API (https://developers.dialpad.com/reference/smssend), and if we pass in the secondary number for a user as the from_number in the request body, the SMS message gets delivered from the primary number instead. from_number.

Why is this? Is there any workaround for this?

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SMS Send POST with a secondary from_number