[asterisk-bugs] [Asterisk 0013766]: No audio when dialling number that has Telco announcement "area code 626 has changed to ..... "

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13766 
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Reported By:                alecdavis
Assigned To:                russell
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Project:                    Asterisk
Issue ID:                   13766
Category:                   Applications/app_dial
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.6.0 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2008-10-22 17:35 CDT
Last Modified:              2009-01-23 12:41 CST
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Summary:                    No audio when dialling number that has Telco
announcement  "area code 626 has changed to ..... "
Description: 
Calling 0016269560260 (from NZ) an Announcement that "area code has changed
to ...." isn't heard. Call keeps ringing.

Call from SIP channel or a FXS port, same result. From a non asterisk
connected phone I hear the announcement.

2 calls below, 2nd call is Digium Fax number.





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 (0098596) prado (reporter) - 2009-01-23 12:41
 http://bugs.digium.com/view.php?id=13766#c98596 
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Hi Alecdavis,
This is not a bug, it is a feature of ISDN.
 
It appears that your telco is using "early_media" to make the
announcement. 

Note that you don´t have "answer" on your firt call. 
But you have "answer" when you call Digium on the second call.

Your company act this way to not charge you when you listen to the
announcement, if there is no answer, you don´t have to pay that call. This
is the early-media feature.

But for an electronic device, if there is no ISDN "answered" message,
asterisk will "think" it is still ringing because this was the last call
state!
Technically this is handled by libpri and not asterisk.


My proposal for resolution is:

Try setting "progressinband=yes" to your sip.conf and it should solve your
problem making you hear the announcement. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-01-23 12:41 prado          Note Added: 0098596                          
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