[asterisk-bugs] [DAHDI-linux 0016644]: On call-waiting events, dropped audio on first call then switch to second call when first call ends without 'flash'

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16644 
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Reported By:                kirkawolff
Assigned To:                
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Project:                    DAHDI-linux
Issue ID:                   16644
Category:                   General
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     acknowledged
JIRA:                        
Reviewboard Link:            
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Date Submitted:             2010-01-18 19:07 CST
Last Modified:              2010-08-22 00:20 CDT
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Summary:                    On call-waiting events, dropped audio on first call
then switch to second call when first call ends without 'flash'
Description: 
I'm running asterisk 1.6.2 on ubuntu karmic.  I was running a asterisk on
ubuntu jaunty, and converted configuration from jaunty to karmic.  I have a
Wildcard TDM400P REV I (according to DAHDI_hardware) with three modules,
fxs, fxo, and fxs.  All calls are between DAHDI FXS channel 1 and SIP.  The
fxs channel 1 is configured in /etc/dahdi/system.conf as fxoks and uses the
mg2 echo canceler.

When a phone call is taking place (an incoming call is answered from
DAHDI/1), and a second call comes in.  The callerid tone is sent, and the
person on DAHDI/1 can continue to hear the person on the other end (the SIP
call), but they cannot hear the person on the DAHDI/1 line.  When the first
caller hangs up, the DAHDI/1 line is immediately switched to the new
incoming phone call without any 'flash' event taking place.  The only
information related to DAHDI in the asterisk debug output is the
following:

VERBOSE[12345] chan_dahdi.c:     -- CPE supports Call Waiting Caller*ID. 
Sending 'FIRST LAST/9515554444'

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 (0126215) kirkawolff (reporter) - 2010-08-22 00:20
 https://issues.asterisk.org/view.php?id=16644#c126215 
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Still seeing bad callwaiting behavior with dahdi 1:2.2.1-0ubuntu2.  I've
re-installed with Ubuntu server 10.04 (after fixing problem with the netjet
driver and the TDM400 PCI VID/PID contention issue), have it on an old
intel motherboard since the guys in IRC seem to hate VIA chipsets, and I
get similarly broken results but not exact.  Now:

1) Phone call with someone (call A)
2) Someone 'beeps in', I get the callwaitingcallerid squawk, I'm able to
continue the conversation with call A.
3) I ignore the incoming call and continue conversation with call A,
hoping call B goes away and leaves a voicemail.
4) After number of rings expires on call B and it is moved to voicemail,
outgoing audio is lost on call A.
5) Call A says "Hello, are you still there".  I say "Yes, I'm still here."
 Call A says "I can't hear you, you must have gone away."  I say "Shit, you
can't hear me."
6) I hang up, turn off callwaiting in my chan_dahdi.conf, restart asterisk
and reinitiate call A.
7) I wait a few days and write this note to you guys hoping something will
change soon. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-08-22 00:20 kirkawolff     Note Added: 0126215                          
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