always thought LNS was Linked Numbering Scheme, in most cases routing calls to multiple TXE2/4/4A, and UAX by changing the dial plan in smaller towns/villages to 6 digits from 3/4 digits and using the first few levels (usually first two digits of subscriber number) to select which exchange a call routed to, although I also remember the codes starting with 9 for calling adjacent charge areas..
