I ran into this problem with using a DynDNS address as the mapping for my ENUM or for my IPKall number. I took your advice Draco and created an alias at SipBroker to point to my DynDNS addy, and then told ENUM and IPKall (and FWD too) to forward calls to my SipBroker address. By changing to this set up, no more fast-busy signals and everything is working great.
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