[asterisk-bugs] [Asterisk 0015337]: Drawn out and static audio on inbound iax2 calls

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=15337 
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Reported By:                deitch
Assigned To:                dvossel
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Project:                    Asterisk
Issue ID:                   15337
Category:                   Channels/chan_iax2
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.6.1.0 
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:             2009-06-16 17:49 CDT
Last Modified:              2009-07-13 03:05 CDT
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Summary:                    Drawn out and static audio on inbound iax2 calls
Description: 
Calls that are inbound on a DID, to which Asterisk has registered using
iax2, have terribly drawn out audio and a lot of static for prerecorded
files (e.g. IVR and Voicemail files in /var/lib/asterisk/sounds). They
sound like:
".... hhhheeeellllllloooooo..... Yyyyyyoooouuuu hhhhaaaavvvveeee " etc.

Specific details:
1) This occurs only on IAX2, not on SIP. I have tried with the exact same
providers, on the same hosts
2) jitterbuffer is off. If I turn jitterbuffer on, no audio at all is
audible.
3) This occurs across two completely separate providers, one in Israel,
one in the US. However, inbound from the ITSPs directly to an IAX2
softphone (e.g. JackenIAX or Zoiper) work perfectly fine.
4) This occurs only when communicating to Asterisk. If the dialer enters
an extension, and is thus connected over Asterisk to a SIP softphone, there
is no problem.
5) This occurs independent of codec. I have the original outbound files
converted to both ulaw and gsm, and it occurs in both cases. The provider
prefers ulaw.
6) CPU usage by Asterisk remains extremely low during the bad output.
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Relationships       ID      Summary
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related to          0015296 TDM call over IAX trunk gives choppy au...
related to          0015220 IAX2 choppy audio with MozIAX, only 20secs
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 (0107632) alecdavis (reporter) - 2009-07-13 03:05
 https://issues.asterisk.org/view.php?id=15337#c107632 
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upgraded to
DAHDI Version: 2.2.0 Echo Canceller:
from http://svn.digium.com/svn/dahdi/linux/tags/2.2.0

Audio now fine, with hardware still disabled.

site2*CLI> dahdi show status
Description                              Alarms  IRQ    bpviol CRC4   Fra
Codi Options  LBO
DAHDI_DUMMY/1 (source: Linux26) 1        UNCONFI 0      0      0      CAS
Unk  YEL      0 db (CSU)/0-133 feet (DSX-1)

site2*CLI> timing test
Attempting to test a timer with 50 ticks per second.
Using the 'DAHDI' timing module for this test.
It has been 1018 milliseconds, and we got 51 timer ticks 

Issue History 
Date Modified    Username       Field                    Change               
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2009-07-13 03:05 alecdavis      Note Added: 0107632                          
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