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global variable.
Time-Based Conditional Branching with GotoIfTime()
Another way to use conditional branching in your dialplan is with the GotoIfTime()
application. Whereas GotoIf() evaluates an expression to decide what to do, GotoIf
Time() looks at the current system time and uses that to decide whether or not to fol‐
low a different branch in the dialplan.
The most obvious use of this application is to give your callers a different greeting
before and after normal business hours.
The syntax for the GotoIfTime() application looks like this:
GotoIfTime(times,days_of_week,days_of_month,months?label)
4 If you want to test this (which you do), you can pick one of your working lab devices, and in the asterisk
database, under the ps_endpoints table, set the callerid field to '8885551212'. Then you can make a call
from it to 214 to see the block in action.
UPDATE asterisk.ps_endpoints SET callerid='8885551212' WHERE id='<endpoint you chose as the
victim>'
5 But we do it this way because it’s easier to read.
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Chapter 10: Deeper into the Dialplan
In short, GotoIfTime() sends the call to the specified label if the current date and
time match the criteria specified by times, days_of_week, days_of_month, and
months. Let’s look at each argument in more detail:
times
This is a list of one or more time ranges, in a 24-hour format. As an example,
9:00 A.M. through 5:00 P.M. would be specified as 09:00-17:00. The day starts at
0:00 and ends at 23:59.
It is worth noting that times will properly wrap around. So, if
you wish to specify the times your office is closed, you might
write 18:00-9:00 in the times parameter, and it will perform
as expected. Note that this technique works as well for the
other components of GotoIfTime(). For example, you can
write sat-sun to specify the weekend days.
days_of_week
This is a list of one or more days of the week. The days should be specified as mon,
tue, wed, thu, fri, sat, and/or sun. Monday through Friday would be expressed
as mon-fri. Tuesday and Thursday would be expressed as tue&thu.
Note that you can specify a combination of ranges and single
days, as in: sun-mon&wed&fri-sat, or, more simply: wed&fri-
mon.
days_of_month
This is a list of the numerical days of the month. Days are specified by the num‐
bers 1 through 31. The 7th through the 12th would be expressed as 7-12, and the
15th and 30th of the month would be written as 15&30. This can be useful for
holidays, which often fall on the same day of the month, but not typically on the
same day of the week.6
months
This is a list of one or more months of the year. The months should be written as
jan-apr for a range, and separated with ampersands when wanting to include
nonsequential months, such as jan&mar&jun. You can also combine them like so:
jan-apr&jun&oct-dec.
6 We have no idea how to implement Easter, but are open to suggestions.
Conditional Branching
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If you wish to match on all possible values for any of these arguments, simply put an
* in for that argument.
The label argument can be any of the following:
• A priority label within the same extension, such as time_has_passed
• An extension and a priority within
the
same context,
such as
123,time_has_passed
• A context, extension, and priority, such as incoming,123,time_has_passed
Now that we’ve covered the syntax, let’s look at a couple of examples. The following