Contexts can be included in other contexts. All included contexts are listed within a single block.
context default { includes { local; longdistance; international; } }
Time-limited inclusions can be specified, as in extensions.conf format, with the fields described in the wiki page Asterisk cmd GotoIfTime.
context default { includes { local; longdistance|16:00-23:59|mon-fri|*|*; international; } }