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countries. Voicemail is where the rubber hits the road, as this is where users come
into contact with time/date stamp information.
Consider a scenario where some users of the system are based in the US, while others
are in the UK.
Internationalization Within Asterisk
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As well as the time difference, another thing to consider is the way people in the two
locations are used to hearing date and time information—in the US, dates are usually
ordered month, day, year, and times are specified in 12-hour clock format (e.g.,
2:54 P.M.).
In contrast, in the UK dates are ordered day, month, year, and times are often speci‐
fied in 24-hour clock format (14:54 hrs)—although some people in the UK prefer 12-
hour clock format, so we will cover that, too.
Since all these things are connected to voicemail, you would be right to guess that we
configure it in /etc/asterisk/voicemail.conf—specifically, in the [zonemessages] sec‐
tion of the file.
Here is the [zonemessages] part of the sample voicemail.conf file that comes with
Asterisk, with UK24 (for UK people that like 24-hour clock format times) and UK12
(for UK people that prefer 12-hour clock format) zones added:
[zonemessages]
; Users may be located in different time zones, or may have different
; message announcements for their introductory message when they enter
; the voicemail system. Set the message and the time zone each user
; hears here. Set the user into one of these zones with the tz=attribute
; in the options field of the mailbox. Of course, language substitution
; still applies here so you may have several directory trees that have
; alternate language choices.
;
; Look in /usr/share/zoneinfo/ for names of timezones.
; Look at the manual page for strftime for a quick tutorial on how the
; variable substitution is done on the values below.
;
; Supported values:
; 'filename' filename of a soundfile (single ticks around the filename
; required)
; ${VAR} variable substitution
; A or a Day of week (Saturday, Sunday, ...)
; B or b or h Month name (January, February, ...)
; d or e numeric day of month (first, second, ... thirty-first)
; Y Year
; I or l Hour, 12 hour clock
; H Hour, 24 hour clock (single digit hours preceded by "oh")
; k Hour, 24 hour clock (single digit hours NOT preceded by "oh")
; M Minute, with 00 pronounced as "o'clock"
; N Minute, with 00 pronounced as "hundred" (US military time)
; P or p AM or PM
; Q "today", "yesterday" or ABdY
; (*note: not standard strftime value)
; q " (for today), "yesterday", weekday, or ABdY
; (*note: not standard strftime value)
; R 24 hour time, including minute
;
eastern=America/New_York|'vm-received' Q 'digits/at' IMp
central=America/Chicago|'vm-received' Q 'digits/at' IMp
central24=America/Chicago|'vm-received' q 'digits/at' H N 'hours'
military=Zulu|'vm-received' q 'digits/at' H N 'hours' 'phonetic/z_p'
european=Europe/Copenhagen|'vm-received' a d b 'digits/at' HM
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Chapter 9: Internationalization
UK24=Europe/London|'vm-received' q 'digits/at' H N 'hours'
UK12=Europe/London|'vm-received' Q 'digits/at' IMp
These zones not only specify a time, but also dictate the way times and dates are
ordered and read out.
Having created these zones, we can go to the voicemail context part of voicemail.conf
to associate the appropriate mailboxes with the correct zones:
[default]
4001 => 1234,Russell Bryant,rb@shifteight.org,,|tz=central
4002 => 4444,David Duffett,dd@shifteight.org,,|tz=UK24
4003 => 4450,Mary Poppins,mp@shifteight.org,,|tz=UK12|attach=yes
As you can see, when we declare a mailbox, we also (optionally) associate it with a
particular zone. Full details on voicemail can be found in Chapter 8.
The last thing to localize in our Asterisk configuration is the tones played to callers by
Asterisk once they are inside the system (e.g., the tones a caller hears during a
transfer).
As identified earlier in this chapter, the initial tones that people hear when they are
calling into the system will come from the IP phone, or from DAHDI for analog
channels.
These tones are set in /etc/asterisk/indications.conf. Here is a part of the sample file,