Library /sys$common/syshlp/ncphelp.hlb CLEAR, MODULE, X25-PROTOCOL, KNOWN_DTES, CALL TIMER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 If used with the CLEAR command, resets the call timer in the
 volatile database to its default value.  If used with the PURGE
 command, resets the call timer in the permanent database to 0.
 This means that the call request will not time out at the local
 DTE, but may be cleared by the network.