[cisco-voip] DAS config

[David Sullivan]

charl.ccrofton at gmail.com wrote:
> Hi,
> 
> On Thu, Apr 17, 2008 at 12:59 PM, David Sullivan
> <David.Sullivan at barnet.ac.uk> wrote:
> 
>>  > Need some pointers on configuring a DAS interface in Northern
>>  Ireland. > Apparently the telco provides this PRI interface that is
>  > "DAS"
>> (never heard of it before) whereby they send a number  > range on the
>> first 12 timeslots and another number range on  > the remaining
>> timeslots. Not sure if I configure it as a  > normal PRI or not?  >
>> 
>>  DASS is a pre-standard ISDN signalling used by BT in the UK that's
>> no longer available for new supply, you can quote for BT (or
>> reseller) to convert the ISDN line to a standard ISDN30 though they
>> will charge for this but you'll have to do this before you can
>>  terminate it on a Cisco gateway. The timeslot configuration is
>> another issue but there shouldn't be any  difficulty handling this
>> once you have a standard euro ISDN30. 
> 
> So this will not work on the cisco equipment unless it is
> converted to standard euro ISDN30 ? Or am I missing something?
> 
That's correct, unless you use something like the old PBX as an
intermediate device to do the conversion for you, I believe that Westell
also used to produce DASS and DPNSS gateways though they're no longer
listed on their website.

We converted two PRIs from DASS to euro ISDN when me migrated from an
old (obsolete) PBX system that didn't support euro ISDN to Callmanager,
the terminations had to be converted from BNC to RJ45 by BT along with
configuration changes within their network. Everything was sequenced so
that the conversion happened on the Friday evening on the weekend of
migration and it all went smoothly.

BT can sometimes take a (long) while before they can carry out the work
after they've received the order so you may have to bear this in mind in
terms of planning any migration or deployment.

David
-----------------------------------------------------------------------------
This communication may contain privileged or confidential information which
is for the exclusive use of the intended recipient.  If you are not the
intended recipient, please note that you may not distribute or use this
communication or the information it contains.  If this e-mail has reached you
in error, please delete it and any attachment.

Internet communications are not secure and Barnet College does not accept
legal responsibility for the content of this message.  Any views or opinions
expressed are those of the author and not necessarily those of Barnet College.

Please note that Barnet college reserves the right to monitor the
source/destinations of all incoming or outgoing e-mail communications.
-----------------------------------------------------------------------------