'Access the credentials_lists
:returns: twilio.rest.trunking.v1.trunk.credential_list.CredentialListList
:rtype: twilio.rest.trunking.v1.trunk.credential_list.CredentialListList'

@property
def credentials_lists(self):

    if (self._credentials_lists is None):
        self._credentials_lists = CredentialListList(self._version, trunk_sid=self._solution['sid'])
    return self._credentials_lists
