According [
RFC3261](https://datatracker.ietf.org/doc/html/rfc3261#section-19.1.2)
The default transport is scheme dependent. For sip:,
it is UDP.
For sips:, it is TCP.
According to the OPTIONS message above, Kamailio tries to use UDP transport for
"sips" schema.
Another approach, as a workaround, update the Contac header and add
"transport=tcp" when using "sips" schema.
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