[asterisk-bugs] [Asterisk 0015128]: sometimes : dial_exec_full: Unable to create channel of type 'IAX2' (cause 20 - Unknown)

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=15128 
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Reported By:                maziar
Assigned To:                
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Project:                    Asterisk
Issue ID:                   15128
Category:                   Channels/chan_iax2
Reproducibility:            sometimes
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:             2009-05-16 00:24 CDT
Last Modified:              2009-05-20 02:01 CDT
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Summary:                    sometimes : dial_exec_full: Unable to create channel
of type 'IAX2' (cause 20 - Unknown)
Description: 
Hi

i frequently i see this error after 5  to 20  try then many time ok and
some times
see this error : 

cli :
[May 16 09:35:53] WARNING[7523]: app_dial.c:1518 dial_exec_full: Unable to
create channel of type 'IAX2' (cause 20 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [501 at default:3] Hangup("IAX2/172.16.20.80:4569-6738", "")
in new stack
  == Spawn extension (default, 501, 3) exited non-zero on
'IAX2/172.16.20.80:4569-6738'
    -- Hungup 'IAX2/172.16.20.80:4569-6738'


i use realtime for iax & sip

i have problem with 
qualify=yes and no


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---------------------------------------------------------------------- 
 (0105061) maziar (reporter) - 2009-05-20 02:01
 https://issues.asterisk.org/view.php?id=15128#c105061 
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please note i have only problem with use iax in real time

also i have not any problem with sip in real time & note iax without real
time in current config. then seems problem in iax in realtime mode

table on postgres :

CREATE TABLE iax
(
  "name" character(20),
  ipaddr character(22),
  port integer,
  regseconds integer,
  username character varying(30),
  "type" character varying(6) NOT NULL,
  secret character varying(50),
  md5secret character varying(32),
  dbsecret character varying(100),
  notransfer character varying(10),
  inkeys character varying(100),
  outkey character varying(100),
  auth character varying(100),
  accountcode character varying(100),
  amaflags character varying(100),
  callerid character varying(100),
  context character varying(100),
  defaultip character varying(15),
  host character varying(31) NOT NULL DEFAULT 'dynamic'::character
varying,
  "language" character(5),
  mailbox character varying(50),
  deny character varying(95),
  permit character varying(95),
  qualify character varying(4),
  disallow character varying(100),
  allow character varying(100),
  nid serial NOT NULL,
  CONSTRAINT iax_pr PRIMARY KEY (nid),
  CONSTRAINT iax_index01 UNIQUE (name)
)
WITHOUT OIDS;
ALTER TABLE iax OWNER TO asterisk; 

Issue History 
Date Modified    Username       Field                    Change               
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2009-05-20 02:01 maziar         Note Added: 0105061                          
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