Hi, I'm pretty familiar with the asterisk, but have only little understanding of SER/OpenSER. I read through some cookbooks and found some things that might help, but I just want to ensure that I'm on the right track before investing a lot of time into it. I have an asterisk running that terminates currently against one (SIP) carrier. We are noticing that the carrier has an increasing rate of short outtages and want a more redundant solution. Currently we have two more carriers and have to switch manually which was fine for the testing period. Now I'd like to route automatically. The routing decision should be based on a least cost basis, for each number the cheapest route shall be used. But if a route is not working properly, mostly these are 5XX Messages, the second cheapest route shall be used. Can I do this failover aspect with OpenSER/LCR too? Is the LCR Module the right point to start, as I have not seen failover strategies? There are some questions left which are more detailed - if a carrier shows to fail often, I just want a few calls routed to that carrier, to determine if its working again. Is there any chance to include network/packet information into the decision too, like roundtrip times, jitter etc? Hopefully someone can help me find the best solution... regards, Knud