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of DAHDI/14169671111. If we wanted Asterisk to ring the PJSIP/SOFTPHONE_B chan‐ |
nel when extension 103 is reached in the dialplan, we’d add the following extension: |
exten => 101,1,Dial(PJSIP/SOFTPHONE_A) |
exten => 103,1,Dial(PJSIP/SOFTPHONE_B) |
exten => 200,1,Answer() |
We can also dial multiple channels at the same time, by concatenating the destina‐ |
tions with an ampersand (&), like this: |
exten => 101,1,Dial(PJSIP/SOFTPHONE_A) |
exten => 103,1,Dial(PJSIP/SOFTPHONE_B) |
exten => 110,1,Dial(PJSIP/0000f30A0A01&PJSIP/SOFTPHONE_A&PJSIP/SOFTPHONE_B) |
exten => 200,1,Answer() |
The Dial() application will ring all of the specified destinations simultaneously, and |
bridge the inbound call with whichever destination channel answers first (the other |
channels will immediately stop ringing). If the Dial() application can’t contact any of |
the destinations, Asterisk will set a variable called DIALSTATUS with the reason that it |
couldn’t dial the destinations, and continue with the next priority in the extension.14 |
The Dial() application also allows you to connect to a remote VoIP endpoint not |
previously defined in one of the channel configuration files. The full syntax is: |
Dial(technology/user[:password]@remote_host[:port][/remote_extension]) |
The full syntax for the Dial() application is slightly different for DAHDI channels: |
Dial(DAHDI/[gGrR]channel_or_group[/remote_extension]) |
For example, here is how you would dial 1-800-555-1212 on DAHDI channel num‐ |
ber 4:15 |
exten => 501,1,Dial(DAHDI/4/18005551212) |
Argument 2: timeout |
The second argument to the Dial() application is a timeout, specified in seconds. If a |
timeout is given, Dial() will attempt to call the specified destination(s) for that num‐ |
ber of seconds before giving up and moving on to the next priority in the extension. |
If no timeout is specified, Dial() will continue to dial the called channel(s) until |
14 We’ll cover variables in the section “Using Variables” on page 96. In future chapters we’ll discuss how to have |
your dialplan make decisions based on the value of DIALSTATUS. |
15 Bear in mind that this assumes that this channel connects to something that knows how to reach external |
numbers. |
94 |
| |
Chapter 6: Dialplan Basics |
someone answers or the caller hangs up. Let’s add a timeout of 10 seconds to our |
extension: |
exten => 101,1,Dial(PJSIP/SOFTPHONE_A) |
exten => 102,1,Dial(PJSIP/0000f30B0B02,10) |
exten => 103,1,Dial(PJSIP/SOFTPHONE_B) |
If the call is answered before the timeout, the channels are bridged and the dialplan is |
done. If the destination simply does not answer, is busy, or is otherwise unavailable, |
Asterisk will set a variable called DIALSTATUS and then continue on with the next pri‐ |
ority in the extension. |
Let’s put what we’ve learned so far into another example: |
exten => 102,1,Dial(PJSIP/0000f30B0B02,10) |
same => n,Playback(vm-nobodyavail) |
same => n,Hangup() |
As you can see, this example will play the vm-nobodyavail.gsm sound file if the call |
goes unanswered (and then hang up). Note that this doesn’t actually provide voice‐ |
mail; we’re just playing a prompt, which could have been any valid prompt. We’ll |
cover sending calls to voicemail later. |
Argument 3: option |
The third argument to Dial() is an option string. It may contain one or more charac‐ |
ters that modify the behavior of the Dial() application. While the list of possible |
options is too long to cover here, one of the most popular is the m option. If you place |
the letter m as the third argument, the calling party will hear hold music instead of |
ringing while the destination channel is being called (assuming, of course, that music |
on hold has been configured correctly). To add the m option to our last example, we |
simply change the first line: |
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