By Leif Madsen
ISBN-10: 144930382X
ISBN-13: 9781449303822
Asterisk has a wealth of good points that can assist you customise your PBX to fill very particular enterprise wishes. This brief cookbook bargains recipes for tackling dialplan basics, making and controlling calls, and tracking channels on your PBX surroundings. each one recipe features a uncomplicated code resolution you could positioned to paintings instantly, besides a close dialogue that gives perception into why and the way the recipe works.
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Asterisk Cookbook: Solutions to Everyday Telephony Problems
Asterisk has a wealth of beneficial properties that can assist you customise your PBX to fill very particular company wishes. This brief cookbook bargains recipes for tackling dialplan basics, making and controlling calls, and tracking channels on your PBX surroundings. every one recipe features a uncomplicated code answer you could positioned to paintings instantly, in addition to a close dialogue that provides perception into why and the way the recipe works.
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Extra info for Asterisk Cookbook: Solutions to Everyday Telephony Problems
Sample text
Conf: ; ; Configure what to do when FollowMe() is requested for Russell. ; We are going to try his desk phone first, and then try to call ; his cell phone. info ; to make outbound calls. ; context = trusted ; ; Call this number first. Give up after 20 seconds. ; number = 7101,20 ; ; Call this number second. Give up after 20 seconds. ; number = 12565551212,20 [leif] context = trusted number = 7102,20 number = 12565559898,20 Now create extensions in the dialplan that will utilize the FollowMe() application to locate the called party: [public_extensions] exten => 7001,1,FollowMe(russell) exten => 7002,1,FollowMe(leif) [trusted] exten => 7101,1,Dial(SIP/russell_desk) exten => 7102,1,Dial(SIP/leif_desk) exten => _1NXXNXXXXXX,1,Dial(SIP/${NUMBER}@outbound_provider) Discussion Admittedly, everything that the FollowMe() application does for you can be implemented directly in the dialplan.
Finally, we set a couple of options. The first option is r, which ensures that Asterisk generates a ringback tone. We want this because we have already indicated to the caller that we will be providing early media. An alternative to this would be to use the m option of Dial(), which would provide hold music instead of ringback. Finally, we use the U option, which executes a GoSub() routine on the called channel after it answers, but before connecting it to the inbound channel. The routine we are using is ackcall, which gives the called channel the option of whether to accept the call.
On the next line, we set the COUNT variable to the number of channels that are marked as being in the myprovider group within the outbound category. The rest of the example demonstrates using this value in a conditional statement so that the dialplan can continue down two different paths depending on the number of channels that matched the GROUP_COUNT() criteria. One reason that you might want to use this particular example is if you want to limit your exposure to fraudulent calls if an account on your system were to be compromised.