[Asterisk-Users] UK ISDN PRI Problems

Tue Apr 27 09:17:36 MST 2004

Hi Chris,

the previous comments about timing source should implemented
(span=1,1,5,ccs,hdb3,crc4). CRC4 should be enabled by default on EuroISDN
but it isn't always in the UK.

Are you sure that NTL have provided you with a true Q.931 EuroISDN PRI
circuit? If the circuit was supplied some time ago for use with existing
equipment it may not be fully EuroISDN compliant. When connecting to Telcos
that use Marconi (GPT) System X switches you must make sure that the circuit
is using ISDN 110 and not ISDN 85. ISDN 85 is an older implementation of
Q.931 in the UK and it does not work with Asterisk E100P or TE410P in my
experience. When checking with NTL ask if your circuit is ISDN 110 or Q.931e
or ETSI; these are the three names that are commonly used by UK carriers for
full spec. EuroISDN PRI.

If you are connected to an ISDN 85 circuit you will experience the symptoms
that you described and may see messages like:

Apr 15 10:15:36 WARNING[11276]: PRI: Read on 49 failed: Unknown error 500
Apr 15 10:15:36 NOTICE[11276]: PRI got event: 4 on span 1
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 1: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 1
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 2: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 2
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 3: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 3
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 4: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 4
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 5: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 5
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 6: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 6
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 7: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 7
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 8: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 8
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 9: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 9
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 10: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 10
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 11: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 11
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 12: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 12
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 13: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 13
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 14: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 14
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 15: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 15
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 17: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 17
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 18: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 18
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 19: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 19
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 20: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 20
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 21: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 21
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 22: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 22
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 23: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 23
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 24: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 24
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 25: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 25
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 26: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 26
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 27: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 27
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 28: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 28
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 29: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 29
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 30: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 30
Apr 15 10:15:36 WARNING[12301]: Detected alarm on channel 31: Red Alarm
Apr 15 10:15:36 WARNING[12301]: Unable to disable echo cancellation on
channel 31
Apr 15 10:15:42 WARNING[11276]: PRI: Read on 49 failed: Unknown error 500
Apr 15 10:15:42 NOTICE[11276]: PRI got event: 5 on span 1
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 1
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 2
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 3
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 4
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 5
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 6
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 7
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 8
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 9
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 10
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 11
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 12
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 13
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 14
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 15
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 17
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 18
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 19
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 20
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 21
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 22
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 23
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 24
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 25
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 26
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 27
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 28
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 29
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 30
Apr 15 10:15:42 NOTICE[12301]: Alarm cleared on channel 31

When the switch engineer enters the RS command (Return to Service) the
messages above will start on your local Asterisk. From the Carrier's switch
console the D channel to the remote Asterisk system appears to come in
briefly and then "drops out" again complaining about I.420 parameters. Some
Telcos have been slow to upgrade their concentrators to support ISDN 110
(full EuroISDN) due to additional memory and CPU requirements but most have
now completed the work and you should be able to request a rebuild by NTL's
datafill team.

It would be useful if you could report back to the list on how you manage to
resolve this issue.

HTH

Darren
--
Comgate
Telco>Internet<Broadcast

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Klaus-Peter
Junghanns
Sent: 27 April 2004 10:30
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] UK ISDN PRI Problems

Hi,

Am Fr, 2004-04-23 um 20.32 schrieb Chris Barnett:
> Advance apologies for the length of this mail;
>
> I have an ISDN PRI supplied by NTL (ex Diamond Cable, Nottingham) which
> is currently working happily with an SDX Index phone system. I have to
> replace this phone system shortly and I've been trying to get a * system
> working for some weeks now. I have configured the dial plan (which
> works) and all my SIP extensions (which all work) along with voice mail
> etc. etc. - all this works perfectly as an internal PBX. My problem
> comes when I try to connect it to my ISDN line.
>
> I have a Digium E100p card which is configured in zaptel.conf thus;
>
> span=1,0,5,ccs,hdb3,crc4

I dont know if it makes a differnce when you only have 1 PRI span, but
you should make the span connected to the telco your primary sync
source, with:

span=1,1,5,ccs,hdb3,crc4

best regards

Klaus
--
Klaus-Peter Junghanns

CEO, CTO
Junghanns.NET GmbH
Breite Strasse 13a - 12167 Berlin - Germany
fon: (de) +49 30 79705390
fon: (uk) +44 870 1244692
fax: (de) +49 30 79705391
iaxtel: 1-700-157-8753
http://www.Junghanns.NET/asterisk/

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