Library /sys$common/syshlp/nclhelp.hlb set, x25_protocol, dte, call_timer  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: Supplied by   Value: Bounded by profile
    profile

    Elapsed time, in seconds, before which a clear packet is sent
    for outgoing calls from the DTE that have received no response. A
    zero value indicates that no clear is sent.