Thanks Eric.
According to: https://tools.ietf.org/html/draft-ietf-mmusic-trickle-ice-02, 
Chapter 5.1:
" As mentioned earlier in this section, Offers and Answers can contain
   any set of candidates, which means that a trickle ICE session
   description MAY contain no candidates at all.  In such cases the
   agent would still need to place an address in the "c=" line(s).  If
   the use of a host address there is undesirable (e.g. for privacy
   reasons), the agent MAY set the connection address to IP6 ::. In this
   case it MUST also set the port number to 9 (Discard).  There is no
   need to include a fictitious candidate for the IP6 :: address when
   doing so."

I interpret this that the browser MAY use IP6 :: in the SDP c-line in case 
there are no ICE candidates. In my case, host candidates exist, still the 
c-line contains no IP. Is this correct behavior? 
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