asterisk users - Oct 2010 - How to test BRI lines energy saving mode ?

Hello,

If my understanding is correct, these days it seems that many ISDN BRI lines
are configured in energy saving mode in which signalling D-channel is
"dropped" until a new call comes in.

Is it possible to replicate this behaviour with Asterisk (when Asterisk is
in NT mode and is seen as a public ISDN by another PBX, for instance) ?
If not, would you it would be a useful addition to Asterisk ?

Regards
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Olivier wrote:
> Hello,
>
> If my understanding is correct, these days it seems that many ISDN BRI
> lines are configured in energy saving mode in which signalling
> D-channel is "dropped" until a new call comes in.
>
> Is it possible to replicate this behaviour with Asterisk (when
> Asterisk is in NT mode and is seen as a public ISDN by another PBX,
> for instance) ?
> If not, would you it would be a useful addition to Asterisk ?
>
> Regards
>
>
Energy saving???  I don't think so. 

If the D channel is down, how would I make an outgoing phone call? 
Something in this mode or your explanation just does not sound right...

Lyle Giese
LCR Computer Services, Inc.

The D-channel isn't actually 'dropped' - it is put in to a
'power-save'
state.

See http://www.isdn-test.de/ihhe12.htm#Heading37 and scroll down to
'Activation / Deactivation' for more information.

Anyway - this is a known 'problem' -
https://issues.asterisk.org/view.php?id=17270

As there is no fix for the above - then I doubt * will be able to
emulate the NT's function.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Lyle Giese
Sent: 07 October 2010 01:28
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] How to test BRI lines energy saving mode ?


Olivier wrote:
> Hello,
>
> If my understanding is correct, these days it seems that many ISDN BRI
> lines are configured in energy saving mode in which signalling 
> D-channel is "dropped" until a new call comes in.
>
> Is it possible to replicate this behaviour with Asterisk (when 
> Asterisk is in NT mode and is seen as a public ISDN by another PBX, 
> for instance) ? If not, would you it would be a useful addition to 
> Asterisk ?
>
> Regards
>
>
Energy saving???  I don't think so. 

If the D channel is down, how would I make an outgoing phone call? 
Something in this mode or your explanation just does not sound right...

Lyle Giese
LCR Computer Services, Inc.


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Well, to go slightly O/T:

If you read the issue tracker for 17270 - it appears to be a LibPri
'fault'.  So I would say that the main work would need to be in LibPri
<Q:is this how DAHDI talks to the ISDN?>.

Maybe someone who knows LibPri and DAHDI better can explain how the two
combine...

Cheers
Andy


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
Sent: 07 October 2010 11:07
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] How to test BRI lines energy saving mode ?




2010/10/7 Andrew Thomas <andy at datavox.co.uk>

The D-channel isn't actually 'dropped' - it is put in to a
'power-save'
state.

See http://www.isdn-test.de/ihhe12.htm#Heading37 and scroll down to
'Activation / Deactivation' for more information.

Anyway - this is a known 'problem' -
https://issues.asterisk.org/view.php?id=17270

As there is no fix for the above - then I doubt * will be able to
emulate the NT's function.




Thanks for these interesting links !

So this Activation/Desactivation feature seems to be missing in
Asterisk.
Would you say it should be implemented in libpri, in dahdi, or both ?


 If you have received this communication in error we would appreciate
you advising us either by telephone or return of e-mail. The contents
of this message, and any attachments, are the property of DataVox,
and are intended for the confidential use of the named recipient only.
If you are not the intended recipient, employee or agent responsible
for delivery of this message to the intended recipient, take note that
any dissemination, distribution or copying of this communication and
its attachments is strictly prohibited, and may be subject to civil or
criminal action for which you may be liable.
Every effort has been made to ensure that this e-mail or any attachments
are free from viruses. While the company has taken every reasonable
precaution to minimise this risk, neither company, nor the sender can
accept liability for any damage which you sustain as a result of viruses.
It is recommended that you should carry out your own virus checks
before opening any attachments. 

Registered in England. No. 27459085.