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

    Support: All
    Default: 600           Value: 1-65535

    Interval, in seconds, during which the SVC remains reserved for
    the previous DTE address after a call is cleared due to lack of
    traffic. This attribute is supported only if the characteristic
    type is x25 da.