SIP mandates a secure media transport when using
a secure SIP transport. To respect this, Ring
disables media when a secure call has no
secure media configured (sipcall.cpp:834).
Instead of failing, a better behavior would be to
force enabling media encryption when TLS is active at
the account level.

Change-Id: I25b77248be5d50bf016f959f0a06ec4850fa642e
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>