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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Andrew wants to take the system down
softly—there are active calls on some channels. He doesn’t want to
accept additional calls on the idle channels. He can’t take the D channel
down without disruption to the active calls.</span></font></p>
<div>
<p style='margin-bottom:12.0pt'><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt'> --Don<br>
<br>
Don Kelly<br>
PCF Corp<br>
Real Support for your Virtual Office TM<br>
651 842-1000<br>
888 Don Kell(y)<br>
651 842-1001 fax<br>
<br>
</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:windowtext;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Lyle Giese<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, February 14, 2008
5:45 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Asterisk Users Mailing List -
Non-Commercial Discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [asterisk-users] ISDN
PRIs and taking a server down formaintenance - blocking issue</span></font></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt'>If you take Asterisk
down, the PRI should go down as the D channel is down. Then the telco
should KNOW that there is trouble with the PRI and those channels are in
trouble busy and not availible. If the telco still tries to push a call
to a channel on a PRI that is down, then the telco is at fault.<br>
<br>
Lyle<br>
<br>
Matt wrote: </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt'>That does sound like what is happening.. Telco knows channel 1-23 are
not busy (so far as they are concerned), however.. so far as you are concerned,
they are busy.. so telco sends the call down... but the equipment doesn't take
it.<br>
<br>
I would *think* the Telco could keep trying channels down the hunt group, but
maybe not? We have, in the past, seen this issue with our dial-up modem
banks.. especially if I would take one offline. However, it is not
a big enough issue (i.e. we don't take things down that often) for me to look
into it fully.</span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt'>On Thu, Feb 14, 2008 at
4:07 PM, Don Kelly <<a href="mailto:dk@donkelly.biz">dk@donkelly.biz</a>>
wrote:</span></font></p>
<div link=blue vlink=blue>
<div>
<p style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>I think the problem is
that the telco presents the call on a specific channel, then zaptel tells it
that the channel is busy.</span></font></p>
<p style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>We need to be able to
tell the telco that each unused channel on a given span is unavailable, and it
will determine that the others are in use and will present the call on a
channel on another span.</span></font></p>
<p style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>A rather ugly work-around
(since Andrew seems to have lots of channels available, and one would assume
that maintenance of this nature would occur during slow periods) would be to
make calls to a DID in the same trunk group on all "idle" channels on
the span shutting down then, when all channels on the span are "in
use" and none of them are doing anything useful, take the span down hard
so the telco will divert all calls to another span.</span></font></p>
<div>
<p style='margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'><font size=2
color=navy face="Times New Roman"><span style='font-size:10.0pt;color:navy'>
--Don<br>
<br>
Don Kelly<br>
PCF Corp<br>
Real Support for your Virtual Office TM<br>
651 842-1000<br>
888 Don Kell(y)<br>
651 842-1001 fax</span></font></p>
</div>
<div>
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size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>
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</span></font></div>
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<p style='margin-left:1.0in'><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <a
href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>
[mailto:<a href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Matt<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, February 14, 2008
2:28 PM </span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Asterisk Users Mailing List -
Non-Commercial Discussion</span></font></p>
</div>
<div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Re:
[asterisk-users] ISDN PRIs and taking a server down formaintenance - blocking
issue</span></font></p>
</div>
</div>
</div>
<div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p style='margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in'><font
size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>Honestly..
this sounds like a telco issue. I understand what the other
person is saying about the PRI still being technically up... BUT... if the
channel is BUSY/BLOCKED/WHATEVER, the Telco should be forwarding the call to
the next available channel, which they clearly are not doing.</span></font></p>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>On Thu, Feb 14, 2008 at 8:29 AM, Andrew Smith <<a
href="mailto:andrews@meadeplc.com" target="_blank">andrews@meadeplc.com</a>>
wrote:</span></font></p>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>Hi Tim,</span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>Imagine the
scenario where we had 10x Asterisk servers, with calls presenting sequentially
starting from the first server, then server two, etc.</span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>If we took
down the first server for maintenance with 'asterisk -rx stop gracefully' we
then will block all incoming calls to all servers as our telco will simply
relay the BUSY back to the caller. If there are a number of calls on the first
server that continue for another 20 minutes, then all inbounds are blocked for
that period of time.</span></font></p>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>We are finding
at present we have to look at the calls on the server and make a decision if we
are busy to simply reboot the server and hence lose calls. Not ideal but then
we don't end up blocking our inbounds.<br>
<br>
What I was hoping to do was find a way to cause the telco to present the call
to the next ISDN30 and therefore would allow us to cleanly take down an
Asterisk server for maintenance without causing this issue. In a sense to put
the ISDN30 into alarm mode while still continuing the active calls.</span></font></p>
</div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>Do you know if
this is at all possible, even if we considered patching zaptel to add this
functionality or does the telco rely on the entire PRI being in alarm before it
presents the call to the next ISDN30 ? This would allow us to run maintenance
on our servers during busy periods without causing disruption, and would be an
excellent feature.<br>
<br>
Many thanks,</span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="'Times New Roman'"><span
style='font-size:12.0pt;font-family:"\0027Times New Roman\0027"'>Andrew</span></font></p>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<div style='margin-left:.5in'>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
</div>
<p style='margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in'><b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> <a
href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>
[mailto:<a href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Tim Nelson<br>
<b><span style='font-weight:bold'>Sent:</span></b> 13 February 2008 18:12<br>
<b><span style='font-weight:bold'>To:</span></b> Asterisk Users Mailing List -
Non-Commercial Discussion<br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:asterisk-users@lists.digium.com" target="_blank">asterisk-users@lists.digium.com</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [asterisk-users] ISDN
PRIs and taking a server down for maintenance - blocking issue</span></font></p>
<div>
<div>
<p style='margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in'><font
size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>Even
if * is shutdown, zaptel is still running and your ISDN channels are still
technically up. Shutting down zaptel should close the channels and put those
circuits into alarm mode.<br>
<br>
Tim Nelson<br>
Systems/Network Support<br>
Rockbochs Inc.<br>
(218)727-4332<br>
<br>
----- Original Message -----<br>
From: "Andrew Smith" <<a href="mailto:andrews@meadeplc.com"
target="_blank">andrews@meadeplc.com</a>><br>
To: <a href="mailto:asterisk-users@lists.digium.com" target="_blank">asterisk-users@lists.digium.com</a><br>
Sent: Wednesday, February 13, 2008 12:03:51 PM (GMT-0600) America/Chicago<br>
Subject: [asterisk-users] ISDN PRIs and taking a server down for maintenance -
blocking issue</span></font></p>
<div>
<div>
<p style='margin-left:1.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hi there,</span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I currently have multiple Asterisk
servers using Sangoma A104d Quad ISDN E1s.</span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Basically our telco is presenting calls in order of the ISDNs on our
servers.</span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial'>SERVER1=1,2,3,4<br>
SERVER2=5,6,7,8</span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial'>We have redundancy in that if
SERVER1 is shutdown then each ISDN PRI is in alarm and the calls will then
presented to PRIs 5,6,7,8 on SERVER2.<br>
<br>
If I have to take SERVER1 offline for maintenance (asterisk -rx shutdown
gracefully) any incoming calls receive a BUSY tone.<br>
<br>
What I would like to know is if there is anyway to get around this and not send
a BUSY back to our callers and somehow allow our telco to present calls
immediately to SERVER2.<br>
<br>
Anyone have any ideas or are we stuck with this behaviour until the calls
drop to 0 and Asterisk shuts down ?<br>
<br>
Thanks,<br>
Andrew</span></font></p>
</div>
<div>
<p style='margin-left:1.0in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
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style='font-size:12.0pt'> </span></font></p>
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<pre style='margin-left:.5in'><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'> </span></font></pre><pre style='margin-left:
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style='font-size:10.0pt'>
<hr size=4 width="90%" align=center>
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face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre
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