Initiate Masked Call
Masking MUST be enabled on the location (422 otherwise). Opens/reuses a MaskingSession + creates CallLog, then asks the carrier to place the call via signed TwiML URL.
Headers
{{tenant_key_name}}
Request
This endpoint expects a multipart form.
technician_user_id
Required: Technician User UUID (middleware resolves to int id)
customer_contact_id
Required: Customer contact UUID
Response
Successful response

