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

    Default: False                              Value: True or false

    Specifies whether an x25 access reachable address entity is used
    to map the supplied NSAP address to a destination DTE class/DTE
    address pair.

    Example:

    set x25 access template TEMPLATE-0 nsap mapping false