Support: L1,L2
    Default: { }			Value: Set of ISDN addresses

    A full set of E.164 ISDN network addresses that a call may be
    directed in order to reach a network number that matches the
    address prefix of the parent reachable address entity. Associated
    with each ISDN network address, but not visible to Network
    Management, is a variable last failure of type binary absolute
    time. This attribute is supported only if access type is ISDN DA.