I’m running SER in one of my only servers to proxy my SIP calls to my trixbox at home. this is because I have my brothers acting a part of the extension @ home, so my mom wont bother where he is , she would call his extension and that’s it. ( He is in Australia ).
2 weeks back, my server went down for unknown reason. after getting it back. I couldn’t start SER again which is strange. anyway I thought may be some day I changed the configuration and that cause me to have an old clean version running while I have bad version saved in ser.cfg 
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Finally, I fixed it again. But that’s after I decided to rebuild a new version and do the full configuration from zero. Honestly, I’m not good in SER. it was running for the last 15 months without any issue. even I couldn’t recall where is the configuration file.