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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Okay, that makes sense. So then, how does
the answer()’d status affect that? From my (admittedly limited) experience, it
seems that playing in-band tones only works if the call has been answered?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Here’s the setup I’m using, maybe it will
help if I give an example of what I’m trying to figure out:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Phone A <-sip-> asterisk site A
<-PRI-> PTSN <-PRI-> asterisk site B<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If then I have a dialplan at site B for
the dialed DID that looks like this:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Playtone(busy)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Busy(20)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And given that I’m using default in-band
tones, what is the expected resulting sound coming out of Phone A?<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Justin </span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
asterisk-dev-bounces@lists.digium.com
[mailto:asterisk-dev-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Richard Mudgett<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, July 10, 2014
10:21 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Asterisk
Developers Mailing List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [asterisk-dev]
Looking for definitive answer for Busy() vs. Hangup() when used on a
non-answered PRI channel</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Thu, Jul 10, 2014 at 10:57 AM, Justin Killen <<a
href="mailto:jkillen@allamericanasphalt.com" target="_blank">jkillen@allamericanasphalt.com</a>>
wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hi,</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I’m using
freepbx, and I’ve gotten myself into a bit of an argument (<a
href="http://issues.freepbx.org/browse/FREEPBX-7706" target="_blank">http://issues.freepbx.org/browse/FREEPBX-7706</a>)
about when to use Busy() vs. Hangup(17). The conversation boils down to
the fact that in a certain condition within the freepbx dialplan, an incoming
PRI call runs the application Playtone(busy) followed by Busy(20). My
issue here is that PRI_CAUSE never gets set, so the calling phone doesn’t ever
ring busy, it just rings normally. I should note that this call is never
Answer()’d. The stance of the freepbx team member is that calling Busy()
should be all that an application needs to do – they shouldn’t have to worry
about writing special code depending on the type of the underlying
channel. I can’t say that I disagree with that, especially after viewing
the official docs, which describe Busy() as:</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>"This application
will indicate the busy condition to the calling channel."</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>This to me
implies that calling Busy() on a PRI channel should internally set PRI_CAUSE =
17.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>What I’m
really looking for here is a definitive answer as to what should change here,
either:</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>a)</span></font><font size=1><span style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Dialplans be required to check channel status and run playtones/busy on
answered channels or hangup(17) on non-answered channels</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in'><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>or</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>b)</span></font><font size=1><span style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Busy(), when called on a non-answered channel, should set the PRI_CAUSE
(or whatever other appropriate variable for the channel)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Lastly, I
should mention that I’ve posted this to the users group, and although I have
gotten workarounds, I have not been able to get a definitive answer on how this
actually <i><span style='font-style:italic'>should</span></i> work, only on how
it <i><span style='font-style:italic'>does </span></i>work and how to work
around it.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
The Hangup(), Busy(), and Congestion() applications are not equivalent<br>
in their behaviours even though some channel drivers treat Busy() as<br>
Hangup(17) and Congestion() as Hangup(34). The Hangup() application<br>
always sets the cause code and immediately begins hangup<br>
procedures. The Busy() and Congestion() applications send a control<br>
frame to the channel driver to handle as it sees fit and then the<br>
application waits with optional timeout for the far end to hangup the call.<br>
For chan_dahdi PRI, this behaviour is configurable in chan_dahdi.conf to<br>
work either way when the Busy()/Congestion() applications are used.<br>
The default is to send the inband busy/congestion tone rather than send<br>
the cause code 17/34 so a caller can hear the tone and hangup.<br>
<br>
Excerpt from chan_dahdi.conf.sample file:<br>
<br>
; PRI Out of band indications.<br>
; Enable this to report Busy and Congestion on a PRI using out-of-band<br>
; notification. Inband indication, as used by Asterisk doesn't seem to work<br>
; with all telcos.<br>
;<br>
; outofband: Signal Busy/Congestion out of band
with RELEASE/DISCONNECT<br>
; inband: Signal
Busy/Congestion using in-band tones (default)<br>
;<br>
; priindication cannot be changed on a reload.<br>
;<br>
;priindication = outofband<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Richard<o:p></o:p></span></font></p>
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