Thanks for posting your question in the Support Community. To my knowledge, this kind of hairpin NAT isn't supported in AOS. It seems the most efficient approach (even if the hairpin was possible) is for local DNS servers to resolve a given hostname to the internal address, while the external DNS hostname resolves to the external IP address.
yeah, i just talked to Adtran support. AOS doesn't support hairpin(now i know the correct term for this) NAT.
i'll use DNS to resolve the hostnames to internal IP's.