Library /sys$common/syshlp/ncphelp.hlb SET, MODULE, X25-PROTOCOL, DTE dte-addr, CHANNELS list  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specifies a list of logical channel numbers (LCNs) reserved for
 outgoing  calls. The list can consist of one or more LCNs.
 Separate multiple channel numbers with hyphens to indicate ranges
 and with commas to indicate individual numbers.  Specify a value
 in the range 0 to 4095 for each LCN.  If a DTE is  to make
 outgoing calls, this parameter is mandatory when you specify a
 DTE for the first time.  The LCN range at the DTE is defined by
 PSDN authorities at subscription time.