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The Enhanced Feature Pack (EFP) supports a variety of SIP trunking approaches, along with a SIP Application Layer Gateway (ALG; reference Configuring the Firewall (IPv4) in AOS) which can be leveraged as needed. My SIP trunking experience has been pretty good with EFP only, but there have been some limitations. Also, I'm told that the ALG features aren't being developed for any enhancement now that range of devices support SBC. I know this is sort of a non-answer, at least non-definitive. But it may boil down to your application.
Regarding the 3430, Standard/EFP hardware cannot be upgraded to SBC because of different requirements. 3430 with SBC is a separate part number must be ordered from ADTRAN as such.
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