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[asterisk-users] Calls on E1 TDMoE span are dropped at random

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f.hackenberger at chel...
Guest

Posted: Fri May 09, 2008 4:32 pm Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

Hi! We are using a red-fone bridge (connected to an E1 line from the Telekom Austria) to provide TDMoE connectivity to our asterisk server (ubuntu 7.10, asterisk 1.4.10 from ubuntu, libpri 1.4.0-2, zaptel 1.4.9.2 from http://support.red-fone.com/downloads/zaptel/). We can establish outgoing calls and receive incoming calls from the POTS. Sometimes however (no aparent triggers) all established calls suddenly drop, the span goes into YELLOW alarm and is restarted. Right after the restart we can use the lines as if nothing ever happened. Just sound quality seems to be decreased. The server is a real machine Intel Core 2 with a dedicated 3Com NIC for the red-fone bridge. We have been in touch with red-fone support for hours. They suggested a loopback cable test (which suceeded, we had a few calls up for about 15 hours) and then concluded that either the E1 line must have a problem or it has to be something with asterisk. Today we had a telco technician on-site who told us that the line works as expected and the configuration settings of the redfone bridge (framing, encoding, timing, etc.) are correct. I'm attaching the logfile with span debug information, as well as the relevant snippets from our configuration files. Maybe someone could help us with a few suggestions, as we are a bit lost at this point. Cheers, Florian === zaptel.conf === dynamic=ethmf,eth4/00:50:C2:65:D2:1A/0,31,2 dynamic=ethmf,eth4/00:50:C2:65:D2:1A/1,31,1 bchan=1-15,17-31 dchan=16 bchan=32-46,48-62 dchan=47 alaw=1-62 loadzone = us defaultzone=us ============== === redfone.conf === [globals] fb=192.168.1.254 port=1 server=00:1C:C4:8E:8C:7B [span1] framing=ccs encoding=hdb3 slave crc4 [span2] framing=ccs encoding=hdb3 slave crc4 ============== === zapata.conf === [trunkgroups] [channels] pridialplan=dynamic prilocaldialplan=local internationalprefix = 00 nationalprefix = 0 localprefix = 03142 usecallerid=yes hidecallerid=no hidecalleridname=no usecallingpres=yes context=default group=0 switchtype = euroisdn signalling = pri_cpe channel = 1-15,17-31,32-46,48-62 ============== -- DI Florian Hackenberger florian at hackenberger.at www.hackenberger.at -------------- next part -------------- A non-text attachment was scrubbed... Name: asterisk_consolelog.txt.zip Type: application/x-zip Size: 5491 bytes Desc: not available Url : http://lists.digium.com/pipermail/asterisk-users/attachments/20080509/8ed36b35/attachment.bin

stotaro at totarotechn...
Guest

Posted: Fri May 09, 2008 4:46 pm Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Fri, May 9, 2008 at 5:32 PM, Florian Hackenberger
<f.hackenberger at chello.at> wrote:

Quote:

Hi!

We are using a red-fone bridge (connected to an E1 line from the Telekom
Austria) to provide TDMoE connectivity to our asterisk server (ubuntu
7.10, asterisk 1.4.10 from ubuntu, libpri 1.4.0-2, zaptel 1.4.9.2 from
http://support.red-fone.com/downloads/zaptel/). We can establish
outgoing calls and receive incoming calls from the POTS.
Sometimes however (no aparent triggers) all established calls suddenly
drop, the span goes into YELLOW alarm and is restarted. Right after the
restart we can use the lines as if nothing ever happened. Just sound
quality seems to be decreased. The server is a real machine Intel Core
2 with a dedicated 3Com NIC for the red-fone bridge.
We have been in touch with red-fone support for hours. They suggested a
loopback cable test (which suceeded, we had a few calls up for about 15
hours) and then concluded that either the E1 line must have a problem
or it has to be something with asterisk. Today we had a telco
technician on-site who told us that the line works as expected and the
configuration settings of the redfone bridge (framing, encoding,
timing, etc.) are correct.
I'm attaching the logfile with span debug information, as well as the
relevant snippets from our configuration files. Maybe someone could
help us with a few suggestions, as we are a bit lost at this point.

Cheers,
Florian

=== zaptel.conf ===
dynamic=ethmf,eth4/00:50:C2:65:D2:1A/0,31,2
dynamic=ethmf,eth4/00:50:C2:65:D2:1A/1,31,1
bchan=1-15,17-31
dchan=16
bchan=32-46,48-62
dchan=47
alaw=1-62
loadzone = us
defaultzone=us
==============

=== redfone.conf ===
[globals]
fb=192.168.1.254
port=1
server=00:1C:C4:8E:8C:7B

[span1]
framing=ccs
encoding=hdb3
slave
crc4

[span2]
framing=ccs
encoding=hdb3
slave
crc4
==============

=== zapata.conf ===
[trunkgroups]

[channels]
pridialplan=dynamic
prilocaldialplan=local
internationalprefix = 00
nationalprefix = 0
localprefix = 03142
usecallerid=yes
hidecallerid=no
hidecalleridname=no
usecallingpres=yes
context=default
group=0
switchtype = euroisdn
signalling = pri_cpe
channel = 1-15,17-31,32-46,48-62
==============

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

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Try "resetinterval=never"

f.hackenberger at chel...
Guest

Posted: Sat May 10, 2008 1:20 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Friday 09 May 2008, Steve Totaro wrote:

Quote:

Try "resetinterval=never"

Thank you very much for your suggestion, I'll try the setting and will
report back whether it solved our problems.

Cheers,
Florian

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

f.hackenberger at chel...
Guest

Posted: Sat May 10, 2008 1:32 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Friday 09 May 2008, Steve Totaro wrote:

Quote:

Try "resetinterval=never"

Hi! I tried setting resetinterval=60 and established a call. The call
survived several channel resets successfully, so this setting is
probably not the problem. Any more ideas?

Cheers,
Florian

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

f.hackenberger at chel...
Guest

Posted: Tue May 13, 2008 4:53 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Friday 09 May 2008, Steve Totaro wrote:

Quote:

Try "resetinterval=never"

Meanwhile I've tried the newest asterisk (1.4.19.1) and libpri (1.4.4),
but the problem persists. I have found out which equipment the telco
uses in front of our redfone bridge. It's a Siemens ULAF+ STU desktop
(a SHDSL Termination Unit). Has anyone got some experience which such a
device and asterisk? Or any ideas how we could proceed with debugging
our problem?

Cheers,
Florian

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

stotaro at totarotechn...
Guest

Posted: Tue May 13, 2008 7:29 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Sat, May 10, 2008 at 2:32 AM, Florian Hackenberger
<f.hackenberger at chello.at> wrote:

Quote:

On Friday 09 May 2008, Steve Totaro wrote:

Quote:

Try "resetinterval=never"

Hi! I tried setting resetinterval=60 and established a call. The call
survived several channel resets successfully, so this setting is
probably not the problem. Any more ideas?

Cheers,
Florian

--

You can be shot several times and not die. I would try
resetinterval=never just to be able to to say "Not the problem" rather
than "Probably not the problem.

PRI debug info would be a great help too.

Thanks,
Steve Totaro

f.hackenberger at chel...
Guest

Posted: Tue May 13, 2008 8:57 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Tuesday 13 May 2008, Steve Totaro wrote:

Quote:

You can be shot several times and not die. I would try
resetinterval=never just to be able to to say "Not the problem"
rather than "Probably not the problem.

I'll do that, although I'm pretty sure that the setting is not the
problem as the yellow alarm occured quite often a few minutes after
restarting asterisk and the default is 3600 seconds.

Quote:

PRI debug info would be a great help too.

The log I sent in the original message contains pri debug messages. I
just had another look at it.

Thanks for your help!

Cheers,
Florian

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

steinwendtner at gmx.net
Guest

Posted: Tue May 13, 2008 10:14 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

Florian Hackenberger wrote:

Quote:

On Tuesday 13 May 2008, Steve Totaro wrote:

Quote:

You can be shot several times and not die. I would try
resetinterval=never just to be able to to say "Not the problem"
rather than "Probably not the problem.

I'll do that, although I'm pretty sure that the setting is not the
problem as the yellow alarm occured quite often a few minutes after
restarting asterisk and the default is 3600 seconds.

Quote:

PRI debug info would be a great help too.

The log I sent in the original message contains pri debug messages. I
just had another look at it.

I did not follow the thread, but can this be a timing problem ?
It might be that the far end goes into maint mode due to slips, or what
ever.

Regards

Hans

stotaro at totarotechn...
Guest

Posted: Tue May 13, 2008 10:40 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Tue, May 13, 2008 at 9:57 AM, Florian Hackenberger
<f.hackenberger at chello.at> wrote:

Quote:

On Tuesday 13 May 2008, Steve Totaro wrote:

Quote:

You can be shot several times and not die. I would try
resetinterval=never just to be able to to say "Not the problem"
rather than "Probably not the problem.

I'll do that, although I'm pretty sure that the setting is not the
problem as the yellow alarm occured quite often a few minutes after
restarting asterisk and the default is 3600 seconds.

Quote:

PRI debug info would be a great help too.

Ah, didn't even know you could add attachments to postings to the list.

It is a little hard to read and quite a bit of info that may or may
not be a problem. Does this happen enough, or do you have enough time
to sit there and catch the exact log output when it happens?

If you can comment out the spans you are not using, that would reduce
a bit of output (I assume you have a single E1 and some POTS (although
I don't see them configured, but you said in your initial posting
that you could dial out on POTS).

"ERROR[7968]: chan_zap.c:8176 zt_pri_error: !! Got reject for frame
120, retransmitting frame 120 now, updating n_r!" and "ERROR[7968]:
chan_zap.c:8176 zt_pri_error: !! Got I-frame while link state 2 -- Got
UA from network peer Link up." looks suspicious. Maybe Red-fone
could give you some insight on these errors.

If you can narrow it down then I am sure someone can better. Again,
comment out spans not in use, set your verbose to 0, and turn on PRI
debugging and try to catch only the event/s that correlate with the
calls being dropped.

I saw Red-fone's products at Astricon, they looked great for failover.

Can you describe exactly how you are utilizing it, including LAN/WAN,
switches, ping times, and other network central details. TDMoE adds
the E (ethernet) component to troubleshooting and I think do to this,
it may be very fragile depending on network conditions.

Don't make the mistake of just focusing on Asterisk and Zaptel in your
troubleshooting process.

Thanks,
Steve Totaro

f.hackenberger at chel...
Guest

Posted: Wed May 14, 2008 2:43 am Post subject: [asterisk-users] Calls on E1 TDMoE span are dropped at rando

On Tuesday 13 May 2008, Steve Totaro wrote:

Quote:

Can you describe exactly how you are utilizing it, including LAN/WAN,
switches, ping times, and other network central details. TDMoE adds
the E (ethernet) component to troubleshooting and I think do to this,
it may be very fragile depending on network conditions.

Don't make the mistake of just focusing on Asterisk and Zaptel in
your troubleshooting process.

Hi!

Thank you very much for your suggestions. Yesterday evening, the telco
technician disabled a feature they call NT1 on their side, which is
supposed to be a protocol for line monitoring. We tested again and were
unable to reproduce the call dropping problem. We established 15 calls
to our private extensions to fill all 30 channels and had the calls
running throughout the night. I just checked, and they were all still
up and running. As it currently appears to me, this line monitoring
feature caused the problems. Unfortunately I have been unable to find
anything related to NT1 and line monitoring on the internet. I've been
in touch with the telco (Telekom Austria) and they will try to find
some information concerning this feature. I'll report back with more
info as soon as possible.
Once again, thank you very much for your support! I really hope this
issue is solved (I've been searching for the cause for more than two
weeks now).

Cheers,
Florian

--
DI Florian Hackenberger
florian at hackenberger.at
www.hackenberger.at

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