[asterisk-bugs] [Asterisk 0012757]: [branch] when BRI span go down cannot make call

[noreply at bugs.digium.com]

The following issue has been UPDATED. 
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http://bugs.digium.com/view.php?id=12757 
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Reported By:                francesco_r
Assigned To:                mattf
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Project:                    Asterisk
Issue ID:                   12757
Category:                   Channels/chan_zap
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.6.0-beta8 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             05-29-2008 12:16 CDT
Last Modified:              05-30-2008 13:25 CDT
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Summary:                    [branch] when BRI span go down cannot make call
Description: 
I have installed Asterisk 1.6beta9 with libpri 1.4.4 and zaptel 1.4.10.1.
I know that BRI support is in alpha stage but i wanted to test because we
european users of asterisk we were "disregarded" until now :)
Misdn works, but not very well. The biggest problem is the echo, also with
hardware echo cancellation card like Digium B410P there are some calls with
echo, perhaps because chan_misdn has internal additional delay (see
http://peter.schlaile.de/mISDN/). The other problem is that the driver of
the cards based on the HFC-multi chipset hang on some circumstances, when
there are poor quality lines, and a reboot is needed (if you unload the
driver the kernel crash...).
I have installed and configured the unofficial qozap driver for Digium
B410P available from
http://svn.digium.com/view/zaptel/team/mattf/bri-related/

I have to say, in preliminar testings, that zaptel and bri works well. No
echo or stability problems occured, comparing the same hardware using
misdn. For now i have only one little problem that have affected for years
the users of bristuffed asterisk...
In Italy, but i think in the whole world, the provider put down the layer
1 very often in BRI lines, but fortunately the qozap driver try to put the
layer 1 up. So i have thousands of this messages in the console:
Primary D-Channel on span 1 down
Primary D-Channel on span 1 up
The span go down for 2 secs circa.
But if someone make a call in the exact moment when the span is down
asterisk correctly fails to call: "Everyone is busy/congested at this time
(1:0/1/0)"
This is an ouput of pri debug:

-- Got Disconnect from peer.
Sending Unnumbered Acknowledgement
q921.c:777 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
  == Primary D-Channel on span 1 down
q921.c:777 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
Sending TEI management message 1, TEI=127
q921.c:777 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
Sending TEI management message 1, TEI=127
Sending Set Asynchronous Balanced Mode Extended
q921.c:206 q921_send_sabme: q921_state now is Q921_AWAITING_ESTABLISH
-- Got UA from network peer  Link up.
q921.c:777 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:728 q921_dchannel_up: q921_state now is
Q921_LINK_CONNECTION_ESTABLISHED
  == Primary D-Channel on span 1 up
q921.c:777 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
Sending TEI management message 1, TEI=127

This is my Zaptel.conf:
loadzone=it
defaultzone=it
span=1,1,3,ccs,ami
bchan=1-2
dchan=3
span=2,0,3,ccs,ami
bchan=4-5
dchan=6
span=3,0,3,ccs,ami
bchan=7-8
dchan=9
span=4,0,3,ccs,ami
bchan=10-11
dchan=12

And this is zapata.conf
[channels]
language = it
switchtype = euroisdn
signalling = bri_cpe_ptmp
pridialplan = dynamic
prilocaldialplan = local
nationalprefix = 0
internationalprefix = 00
overlapdial = yes
priindication = passthrough
echocancel=yes
echocancelwhenbridged=no
group = 0
context=from-zaptel
channel => 1-2,4-5,7-8,10-11

So i think that perhaps is necessary to reduce the time of this down
interval or, better, force asterisk to put the layer 1 up so the call can
proceed. Misdn in misdn.conf has the option that solve this situation
"pmp_l1_check=no".
Thank you
Francesco

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Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
05-30-08 13:25  Corydon76      Summary                  when BRI span go down
cannot make call => [branch] when BRI span go down cannot make call
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