[Asterisk-Users] Zombie SIP channels

[Pedro]

Ok - I finally found out what was causing the ZOMBIE channels.

Now follow me on this one :)

It appears that if you are using a Cisco 7960 and are on a call and
want to transfer the call to another extension - if you press "more"
and "Trnsfer" and dial the extension and you hit the Trnsfer button
again before the extension answers, a ZOMBIE channel is created.

If you use BlindXfer, it does not create the ZOMBIE channel.

I have now informed my client that if they want to do a Blind
Transfer, to use the BlindXfer softkey instead of the Trnsfer softkey
or just use the # key to do a blind transfer.

Now, I am running Asterisk CVS-v1-0-11/12/04-15:32:45. I would be
interested in knowing if later versions of asterisk exhibited this
same behavior.  Any feedback would be appreciated.

Thanks,
Pedro


On Fri, 11 Feb 2005 08:32:43 +0100, Florian Overkamp
<florian at obsimref.com> wrote:
> Hi,
> 
> > -----Original Message-----
> > Ok this is odd - caught it again twice today.  The more I thought
> > about what has changed on the server I realized that I was not using a
> > timing device before, but am now using ztdummy.  I if that could be
> > causing the zombies?
> 
> > > > http://bugs.digium.com/bug_view_page.php?bug_id=0002938
> 
> I don't think so, but who knows. The patch resolves a locking issue that may
> or may not be timing-source dependant. I've seen the issue occur after call
> transfers in scenario's where I used a few chan_local's.
> 
> Do yourself a favour:
> 
> - If you can, unload the ztdummy and test for a while. However, this may put
> the issue to sleep - but it won't solve it!
> - After that, load ztdummy again and apply the two lines in channel.c. Test
> again. Good chance the issue will be gone.
> 
> Report results here :)
> 
> Florian
> 
>