[Devel] how to alter the ACK to a 487

[S G]

Question, how do I alter the ACK to a 487? I need to be able to run subst on 
the ACK so i can do translations on the "TO" and "FROM" headers when a call 
is sent to a carrier. I then translate it back when recieving messages from 
the carrier. I've been able to do the translations on all other messages but 
cant find the routing block that will let me alter the ACK to the 487. I see 
in the docs that t_on_reply() does not handle "local generated replies". Is 
it possible?

Thanks,
Sumeet

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