Back to Back PRI with MGCP Gateways

I?ve got a 3825 with T1 voice modules (RJ45)..
They are configured as MGCP managed by a set of call managers.
On Friday, I have to integrate this gateway with an old Mitel switch, which will be used during a 2 year phased migration to get calls between old and new systems? To prepare for that, I have setup the T1s back to back for testing/validation that my MGCP config is working.
I can configure those T1s as ?T1 CAS? trunks, and put a crossover cable between them, make a route pattern 3.xxxx and have the call go out one T1, and back in the other, and it works great? The problem is that there?s no caller ID information set. In the trunk configuration screens, there are fields to specify that callerID should, or should not be sent, etc, but it just doesn?t go.. I?m not terribly surprised by this, because I don?t think there?s any protocol defined for the ?plain? T1 to transfer callerID.. I guess I was just hoping that somehow, it would work! :-)
What I would REALLY like to do, is to put these two T1s in PRI mode, since I *KNOW* a PRI can send callerID, but to do that, I have to have one of the ports emulate the CO-side switch.
When configured as PRI signalled T1s, I saw a pull-down that said something like ?Protocol Side? or ?Protocol Mode? (Sorry, it?s not configured as PRI right now, so I can?t look at the verbiage), and the selections were ?Network? and ?User?, which sound to me as if it?s EXACTLY what I need, but I couldn?t get it to come up to even test? It acted as if I had a timing issue, even though I hadn?t changed any timing parameters from the T1 CAS settings that worked (One internal, one external).. I was getting intermittent amber alarms, and the trunk never came up.
Unfortunately, I can only change the configs on this thing early in the morning, because yesterday, some of the MGCP control I was doing through the CM gui actually bounced their WAN T1s that are in the same router, so now I have to be careful!!
What I would like, is to get a definitive answer to whether two MGCP controlled T1s can be back to back in a PRI signaling mode, and/or if there?s another way to get callerID across a T1 link without one end of it being the CO itself. Ultimately, it won't be a cisco-cisco crossover, but rather a cisco-mitel solution, so whatever I come up with MUST be standards based, so at least I can have something to expect the Mitel engineer to be able to do..
Any help would be GREATLY appreciated!!!
-Steve

Steve,
Never tried a back-to-back PRI with both routers being MGCP. I have in my lab two routers back to back with one router being edge voice gateway controlled by mgcp and the other being a pstn simulator. On the edge voice gateway the following configs exist.
controller t1 1/0
pri-group timeslots 1-24 service mgcp
ccm-manager mgcp
mgcp
mgcp call-agent
int s1/0:23
isdn switch-type
isdn incoming-voice voice
On the PSTN router (which emulates a PSTN switch)
controller t1 1/0
pri-group timeslots 1-24
int s1/0:23
isdn protocol-emulate network
isdn switch-type
isdn incoming-voice voice
This should work for back-to-back PRI pretty well.

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Back to Back PRI with MGCP Gateways

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