[asterisk-bugs] [Asterisk 0019128]: Asterisk 1.8.x Skips DTMF Digits on a First DAHDI Initiated Call

[Asterisk Bug Tracker]

The following issue has been UPDATED. 
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https://issues.asterisk.org/view.php?id=19128 
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Reported By:                vmikhelson
Assigned To:                
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Project:                    Asterisk
Issue ID:                   19128
Category:                   Channels/chan_dahdi
Reproducibility:            sometimes
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:           1.8.3.2 
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:             2011-04-15 20:59 CDT
Last Modified:              2011-04-19 01:13 CDT
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Summary:                    Asterisk 1.8.x Skips DTMF Digits on a First DAHDI
Initiated Call
Description: 
I know it sounds weird, and this is part of the reason I have not reported
that sooner.

As I upgraded from 1.6.2.x to 1.8.x several months ago I am experiencing
this problem.   If a call is initiated from a DAHDI extension after no
DAHDI extensions were used for some time, arbitrary DTMF digits are skipped
and the call fails.  If the call is redialed it goes through.  Normally
just one (1) redial attempt is sufficient.  Replicated from different
analog phones.

Troubleshooting and observations:
1. Provided external power to the TDM400P with FXS daughter cards.  It did
not help.
2. Using RXGAIN / TXGAIN in /etc/asterisk/dahdi-channels.conf on another
TDM410 card makes situation worse (I do realize that this one sounds crazy,
but I verified this one by process of elimination).
3. Played with echo cancellation parameters with no luck.


Configuration:

Asterisk 1.8.3.3
DAHDI Version: 2.4.1.2 Echo Canceller: MG2, HPEC
FreePBX 2.9.0rc1.3

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 (0133907) vmikhelson (reporter) - 2011-04-19 01:13
 https://issues.asterisk.org/view.php?id=19128#c133907 
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Please note the following:
1. the problem is experienced on a generic hardware, Digium card faces
outside, the immediate problem is on the internal extensions;
2. the problem started manifesting itself after Asterisk 1.8 started being
used;
3. there is strange interdependency between gain settings on one card and
problem worsening on another.

What makes you think that it is necessarily a hardware issue?

Thanks. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-04-19 01:13 vmikhelson     Note Added: 0133907                          
2011-04-19 01:13 vmikhelson     Status                   closed => new       
2011-04-19 01:13 vmikhelson     Resolution               won't fix => reopened
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