[asterisk-users] Unable to create channel of type 'DAHDI'(cause 0- Unknown)

[Karl Fife]

Appears completely resolved!
No more home-spun patches!
Thanks!
-K



----- Original Message ----- 
From: "Barry Miller" <asterisk-users at notanet.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Thursday, January 28, 2010 10:40 PM
Subject: Re: [asterisk-users] Unable to create channel of type 'DAHDI'(cause 
0- Unknown)


> Interesting.  I had the same problem last Sept with a TDM800, DAHDI 
> 2.2.0.2.
>
> Shaun Ruffel of Digium pointed me to
>  https://issues.asterisk.org/file_download.php?file_id=22725&type=bug
> which fixed it for me.  This fix is already in 2.2.1.
>
> -- 
> Barry
>
> On Thu, Jan 28, 2010 at 07:30:57PM -0600, Karl Fife wrote:
>> I have had the exact same problem for over a year on my server sporting 
>> the
>> TDM800 but NOT on my server with the TE212P.  Both servers run the same
>> version of Linux, Asterisk and DHADI.
>>
>> The problem has remained consistent through all versions of DAHDI 2.0.x
>> through 2.2.0.2, and every version of Asterisk which I have I've tried 
>> which
>> includes various iterations of 1.6.0, 1.6.1, and 1.6.2.  Currently 
>> 1.2.6.1.
>> Surprisingly I also observe that I can even compile & install NEW 
>> versions
>> of Asterisk and/or DAHDI, and NOT observe the bug provided that I do NOT
>> bounce the server.
>>
>> A developer (not an asterisk developer) named Jim Duda posted this issue 
>> to
>> the list back in October of 08.   (Asterisk 1.6.0-beta9 & DAHDI 2.0.x
>> originally for him).  After what he described as considerable effort he
>> found that by changing one line in chan_dahdi.c the issue appeared to be
>> resolved (below).  His simple patch (below) has works (for me too) as a
>> stop-gap.
>>
>> I posted this the DEV list back January of 09, and the issue was reopened
>> and then closed as 'fixed' .  It would appear the issue needs to be
>> re-reopened, as it's now appearing less specific to my hardware or
>> configuration.
>>
>> https://issues.asterisk.org/view.php?id=13786
>> Duplicate issue to 13927
>>
>> If I do not patch chan_dahdi (below), this is what I (still) observe:
>> ONLY after a system reboot, any attempt(s) to dial from a device attached 
>> to
>> an FXS port on my TDM800P, result in the following error :
>>
>> WARNING[2975]: app_dial.c:1502 dial_exec_full: Unable to create channel 
>> of
>> type 'DAHDI' (cause 0 - Unknown)
>>   == Everyone is busy/congested at this time (1:0/0/1)
>>
>> BUT after the first INBOUND call to any FXO port on the device, the FXS 
>> port
>> works normally until the next reboot.
>>
>> (Asterisk 1.6.2.1 & DAHDI 2.2.0.2 (& earlier ) Centos 2.6.18-164.11.1.el5 
>> #1
>> SMP Wed Jan 20 07:39:04 EST 2010 i686 i686 i386 GNU/Linux
>>
>> Does anyone else observe this?  Could it be specific to certain
>> (mis)configurations?  It's possible that others have the issue but do not
>> know it.  With any inbound call volume it may be nearly transparent :-)
>>
>> -Karl
>>
>> JIM's ONE-LINE FIX ----
>> On line 8730 (I think it's still on this line) of chan_dahdi.c
>> replace a "return 0"  with return "1".
>>
>> if (par.rxisoffhook)
>> return 1;
>> else
>> - return 0;
>> + return 1;
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Walter Arguello" <walter_arguello at yahoo.com>
>> To: <asterisk-users at lists.digium.com>
>> Sent: Thursday, January 28, 2010 6:15 PM
>> Subject: [asterisk-users] Unable to create channel of type 'DAHDI' (cause 
>> 0-
>> Unknown)
>>
>>
>> > Hi,
>> >
>> > I have a tdm22b (2 fxs / 2 fxo)
>> >
>> > When Asterisk is just started, outbound calls routing to fxo port, do 
>> > not
>> > working with error:
>> >
>> > Unable to create channel of type 'DAHDI' (cause 0 - Unknown)
>> >
>> > Inbound calls to fxo port work fine.
>> >
>> > After first inbound call, the outbound calls starts working.
>> >
>> > CentOS 5.4
>> > asterisk 1.6.0.21-1
>> > dahdi 2.2.1.-1
>> >
>> > Can anybody help me to identify what is the possible cause of problem?
>> >
>> > Thanks,
>> >
>> > Walter.
>> >
>> >
>> >
>> >
>> >
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>>
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