Sending X- SIP headers does not generate SipHeader_ parameters

According to:https://www.twilio.com/docs/voice/api/sending-sip

If I send an INVITE to a twilio number on sip trunk with custom X-xxxx headers in the invite, the hook ( function, twinmlbin etc .. ) should pass a SipHeader_xxxx parameter for each.
But the hook never receives the extra parameters. Is there a particular setting which needs to be activated?

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