Have SEMS any
advantages over FreeSWITCH for topology hiding?
More narrow and specialised use-cases, so you don't have to deal with
stripping it of PBX and miscellaneous application features. It's more of a
dedicated B2BUA (with its sbc module), in this case.
I tried to use SEMS but I've got error, which was reported about 2
years ago without any decision -