I assume that the registrar is rewriting the request URI of the request to the 
SIPS scheme. The behaviour of the registrar by adding a SIPS also to its 
Record-Route header is then according to the standard:

```
         The URI placed in the Record-Route header field MUST resolve to
         the element inserting it (or a suitable stand-in) when the
         server location procedures of [4] are applied to it, so that
         subsequent requests reach the same SIP element.  If the
         Request-URI contains a SIPS URI, or the topmost Route header
         field value (after the post processing of bullet 6) contains a
         SIPS URI, the URI placed into the Record-Route header field
         MUST be a SIPS URI.
```

You could set the rr parameter "ignore_sips" on the registrar, if you want them 
to only insert the SIP scheme.

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