Asterisk Cookbook: Solutions to Everyday Telephony Problems by Leif Madsen PDF

By Leif Madsen

ISBN-10: 144930382X

ISBN-13: 9781449303822

Asterisk has a wealth of beneficial properties that will help 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 setting. every one recipe incorporates a easy code resolution 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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Info There are a few more useful optional headers that can be provided with the Origi nate action: ActionID: This is a custom value that will also be included in any responses to this request. It can be helpful in custom applications that may have many outstanding requests at any one time to ensure that responses are associated with the proper request. Variable: NAME=VALUE This header can be specified multiple times in an Originate request. It will set channel variables on the outbound channel.

Conf file, you configure phone numbers, not devices, for the application to call. We specify a 20 second timeout for this outbound call attempt. 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.

In addition to changing the volume prior to calling an application, with the p option we can permit the VOLUME() function to listen for DTMF to adjust the volume of the channel. To increase volume, use the * key. To lower the volume, use the # key. With our current dialplan, the DTMF can be adjusted by the caller, which may not necessarily be what we want. info need to execute a subroutine on the other channel just prior to bridging. We can do this with the U() option to the Dial() application: exten => 100,1,Verbose(2,Incoming call from ${CALLERID(all)}) same => n,Dial(SIP/0000FFFF0001,30,U(VolumeAdjustment^3)) same => n,Hangup() exten => s,1,Verbose(2,Adjusting volume for other channel) same => n,Set(VOLUME(RX,p)=${ARG1}) same => n,Return() We could use the IF() function to control whether the subroutine is executed by the Dial() application: same => n,Dial(SIP/0000FFFF0001,30,${IF($[${CALLERID(num) = 12565551212]?

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Asterisk Cookbook: Solutions to Everyday Telephony Problems by Leif Madsen

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