RE: [Sigtran] ISDN BA layer 1 activation

Thomas,

Sorry for the late reply.  Please see below.

Ken

At 10:55 AM 3/22/2004 +0100, Miesch, Thomas wrote:
>Hello Ken
>Thank you for your answer.
>But there still remains a question or a point where I would like some
>clarification.
>In europe normally the ISDN BRI is deactivated and will be activated on
>a call by call basis.
>For originating calls there are no problems, the activation can be done
>without problems.
>But for terminating calls we must activate the layer 1, before we can
>send a message to the subscriber

do you have originating and terminating backwards in your description?

>How can this be done?
>One way would be we listen to the layer 3 setup message and if we
>receive it we activate layer 1.
>The setup will be sent in a DL-UNIT-DATA. Is this the way to go or are
>there other recommend solutions?

Sorry, I've never done a BRI implementation.  I would assume
that the SG would bring layer 1 up when it received a DL-UNIT-DATA
and the link was down.  Why does it have to look to see if
it is a SETUP message?

>The activation can take several seconds (up to 7s), so the timeout for
>an response to the setup message
>must be large enough in the SG? 

The Q.931 stack has timer that deals with response to SETUP.

>Best Regards
>Thomas
>
>>-----Original Message-----
>>From: Ken Morneault [mailto:kmorneau@cisco.com]
>>Sent: Friday, March 19, 2004 3:50 PM
>>To: Miesch, Thomas; sigtran@ietf.org
>>Subject: Re: [Sigtran] ISDN BA layer 1 activation
>>
>>
>>
>>Thomas,
>>
>>The MG is responsible for Layer 1
>>activation.  It is out of scope for
>>IUA.
>>
>>Regards,
>>
>>Ken
>>
>>
>>At 03:39 PM 3/19/2004 +0100, Miesch, Thomas wrote:
>>
>>>
>>>
>>>Hello
>>>
>>>After reading of the megaco standards and the IUA RFC.
>>>
>>>The question remains how the ISDN BA layer 1 activation is done.
>>>
>>>I didn't find any informations about it.
>>>
>>>
>>>
>>>As I understand there was a proposed IL1A draft (draft-bouwen-sigtran-
>>il1a-01.txt) by Mr. Bouwen and Mr. Morneault.
>>>
>>>But this paper has expired and is no longer valid.
>>>
>>>Somewhere I read that that paper is not in the focus of the Sigtran
>>working group
>>>
>>>and will be handled only as an extension for the IUA standard.
>>>
>>>But in the new draft of the IUA standard
>(draft-ietf-sigtran-rfc3057bis-
>>00.txt)
>>>
>>>I didn't saw any information about that issue.
>>>
>>>
>>>
>>>So the questions stay:
>>>
>>>How should the layer1 activation be handled?
>>>
>>>Who is responsible for the activation of the ISDN BA Layer 1, the MGC
>or
>>the MG?
>>>
>>>If the responsibility is by the MGC, how the Layer 1 activation is
>done?
>>>
>>>In which document the activation sequence is described?
>>>
>>>
>>>
>>>
>>>
>>>Best Regards
>>>
>>>Thomas Miesch
>>>
>>>
>>
>
>
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