Meta's Calls API documents `action: 'connect'` (alongside `pre_accept`,
`accept`, `reject`, `terminate`) as the required field on POST /calls
for business-initiated calls. The previous body used `type: 'audio'`,
which is the /messages media shape — Meta currently accepts it because
unknown fields are ignored, but that's an implicit contract that could
break the moment validation tightens.
Tanmay Deep Sharma
6d168f3c96