Library /sys$common/syshlp/nclhelp.hlb set, x25_access, template, rpoa_sequence  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: No DTE addresses              Value: Set of DTE addresses

    Private Operating Agency sequence of transit networks to be used
    in setting up the call. Format the values to specify a set of
    DTE addresses. Each DTE address is four digits long. An empty set
    indicates that no sequence is included in the outgoing call.