[sr-dev] [kamailio/kamailio] usrloc keepalive does not work for TLS connections (Issue #3178)

[sergey-safarov]

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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