What I find weird is that this name looks like the usually automatically generated reverse DNS entries Internet Service Providers use...
I guess your PBX must be externally hosted...
What I don't get is, if it's an externally hosted server, why there does not seem to be a name that resolves to that server (for you to remote your server...).
(I mean something besides localhost (ie 127.0.0.1)....)
Good luck and have a nice day!
Nick