[SR-Users] How is ruid calculated

[Kjeld Flarup]

I got two tablets registering with the same username, this used to work 
but now I got a bug report that only one of them gets a call.

I found out that the problem is in the ruid column as they both end up 
with this ruid value uloc-1-5bd0abe9-83c-e4

How is that ruid value calculated, and how can I change this?

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