[Kamailio-Users] Carrierroute and or LCR

I am preparing to add a new upstream SIP provider to my network, and now have a requirement to route based on the number that the user is calling. From what I have read it appears that LCR is the better method for doing this. I have one small issue in that I have a few customers who switch through my network in order to get to a specific carrier. Currently I am using carrierroute with all of my customers in order to support the ones that need to switch to specific carriers, and everyone else takes the default carrierroute. Can carrierroute and LCR be used together? If so can you give me a few pointers so that I can get a lab system working. If not can you suggest whether or not carrierroute could or should be used to route based on rate center. The rate center list from my new carrier is about 31,000 rows. If carrier route cannot or should not be used for this purpose, can you recommend a way that LCR can be used, and still have a few customers switch out to a specific carrier regardless of the number dialed? Thank You Stagg Shelton