All lines that starts with semi-colon ";" is treated as comments and is not parsed.
The ";--" is a marker for a multi-line comment. Everything after
that marker will be treated as a comment until the end-marker "--;"
is found. Parsing begins directly after the end-marker.
;This is a comment label = value ;-- This is a comment --; ;-- Comment --; exten=> 1000,1,dial(SIP/lisa)