Re: (ASCEND) ISDN over 24 Channel T1

["Max User" <maxed_out_user@hotmail.com>]

Just want to add a little to this discussion.  Remember that you will only 
get up to 56K for ISDN callers since T1s use robbed-bit signalling and that 
prevents the T1 from being able to utilize the 8th bit on each channel on 
every 6 frames.  If the T1 was nailed, then you can get clear 64K on every 
channel (but for what you want to do, you can only get 56K ISDN).

If you were to use the "Collect DNIS/ANI" feature on the Max (this is in 
case you want to also have modem callers in the future), remember that it is 
only supported with the Inc-w-200 or the Inc-w-400 setting.  All other 
settings on the line configs of the Max will not work (in fact, the 'Collect 
DNIS/ANI' parameter will say n/a).

Other than that, yes, it's completely possible to have ISDN callers call 
into a T1.



Dennis Duval wrote:           (written on 06/22/00 at 13:13)

]Yes, it is completely possible.  I have just finished setting my
]system up to do this very thing.  It was not an easy road for me
]because of difficulties in me understanding what needed to be done
]by the phone company and then relating that to them.  Also the
]multilink works perfectly.  My ISDN customers are getting 112 Kbps
]over dual channels.

Thank you very much for that report!  I was hoping that someone
would post something like that (even though I am about to test it
out here for myself since I'm now pretty sure I can do it).


]This is what it finally came down to.  The telco had to set up to
]send digits on an incoming call.

The nice part about my installation is that I don't have to worry
about that stumbling block.  My max4048 terminates only ISDN
callers, and all analog modem cards have been removed.  Therefore,
my max does not need to be able to distinguish between call
types, because it handles all incoming calls as ISDN data calls.
We did this in order to terminat DOV (Data Over Voice), so that
our users could make their data calls 'look' like voice calls
(at 56kbps) so that they could avoid paying $.01/minute/channel
which is charged by the telco for data calls.  Now we just
want to go one step further and replace our $750/mo T1/PRI
with a $210/mo CT1.


]The hardest part is to find someone at the Telco who good with
]translations and who will help you out.  If your Telco happens to be
]Sprint, I can put you in touch with someone.

I  know what you mean... I have been down that road more than once...
which is why I'm very glad that I don't think I need to for this
particular case.  :)

Thanks again for the excellent info!

___________________________________________________________________________
Joe Pautler, E.I.T.                             University at Buffalo
CIT/OSS Network Engineering                     224 Computing Center
http://www.oss.buffalo.edu/~pautler             (716) 645-3536
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