But I would like asterisk to accept the IMTs.. and the only way to do that is to find out what DS0 to take and place the calls on based on the SS7 messages. I guess one of the things I'm not clear on is going from SS7 to SIP-T, I'm not sure where the state machine exists..
If that's the case, then you external box is just an SS7<->SIP-T translator, right? It's not involved in the media path at all.
It seems to me that if Asterisk is going to be involved in setup/teardown of the DS0s, then it needs to be involved in the signaling as well. Probably the best way to achieve this is going to be for Asterisk to support SIGTRAN (or one of the other SS7-over-IP solutions) and use an external SS7-to-SIGTRAN translator (or get SIGTRAN from your telco(s), if they support it).
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