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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