CUCM v11 - Outgoing Calls Broken

My company has multiple sites, two here in the US, one in California another in Texas plus a HQ outside the US. We're using CUCM v11 here in the CA site. Last week, we lost outgoing calls to either the Texas location or Outside-US location. They could call here but calls there got a busy signal.

I've tried tracing the calls but the routing isn't making a lot of sense. We managed to get one of the SIP Trunks running that was down, which routes a particular service for our helpdesk, but the other calls still aren't working.

Our old 3rd party support was provided by UC Right, but they refuse to help us without signing a full year support contract, which we can't afford.
This is beyond my ability to troubleshoot, I can't even fully figure out what the call routing is for the Texas or Outside-US numbers in the system.

What's the best way to find an independent Cisco contractor to help us out?