Gets what extensions are supported by the remote party.

def _get_extensions(self, params):
        """
        Gets what extensions are supported by the remote party.
        """
        for k, v in params:
            if k == SCTP_PRSCTP_SUPPORTED:
                self._remote_partial_reliability = True
            elif k == SCTP_SUPPORTED_CHUNK_EXT:
                self._remote_extensions = list(v)