[asterisk-bugs] [Asterisk 0017085]: [patch] Overlap dialing to PSTN failing after #16789

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17085 
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Reported By:                shawkris
Assigned To:                mattf
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Project:                    Asterisk
Issue ID:                   17085
Category:                   Channels/chan_dahdi/SS7
Reproducibility:            always
Severity:                   trivial
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.30 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-03-23 14:13 CDT
Last Modified:              2010-03-23 17:53 CDT
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Summary:                    [patch] Overlap dialing to PSTN failing after
https://issues.asterisk.org/view.php?id=16789
Description: 
In the UK, local and national calls can be variable length. In Asterisk
1.4.26.2 (and previously) the following dialplan (extract) works:

;National Calls
exten => _0[127]XXXXXXXX!,1,Dial(${GLOBAL(TRUNK)}/${EXTEN})
exten => _0[127]XXXXXXXX!,2,Hangup

In Asterisk 1.4.30, after the 10th digit has been received the call goes
to CALL PROCEEDING. No further digits are then received and forwarded to
the PSTN. It appears the ability to do "pass-through" overlap dialling
doesn't work anymore.
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 (0119778) shawkris (reporter) - 2010-03-23 17:53
 https://issues.asterisk.org/view.php?id=17085#c119778 
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Thank you for the patch to test - I'll give this a try out of hours. We
also experienced two failures after upgrading to 1.4.30 from 1.4.26.2 so I
need to test carefully. Our legacy PBX dropped the ISDN30 link to Asterisk
and couldn't re-establish it until Asterisk was killed and restarted (span
2 repeatedly flapping in and out of red alarms). The connection to the PSTN
remained active and usable.

Going back to 1.4.26.2 stablised the system (as it has been for
https://issues.asterisk.org/view.php?id=5#c2 years).
The physical link, DAHDI (2.2.0.2) and Libpri (1.4.10.2) are unchanged
between the stable and unstable versions. I'll open a seperate bug if I can
find the cause and it's not related to this CALL PROCEEDING issue. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-03-23 17:53 shawkris       Note Added: 0119778                          
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