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Update Retell transfer headers and REFER controls

PATCH 
/api/v1/phone-numbers/:id/retell-transfer-headers

Updates only selected functions. Managed PSTN modes require an active entitlement and tenant-owned verified destination ID. Published agents are forked to writable draft versions, patched, published, and reassigned to the phone number before success is returned.

Request​

Responses​

Selected transfer functions updated.