Re: (ASCEND) ISDN over 24 Channel T1

[Joel Wittenberg <joelw@ascend.com>]

Dennis -

Since a T1 (not PRI) does not deliver any Bearer Service information on
incoming calls, neither the TNT nor the Portmaster gets any help from the
telco in determining whether the call is analog or ISDN (this is one reason
why PRI makes life simpler).  The normal ways to determine whether the
call should be directed to a modem or an hdlc processor are (no doubt
there are other ways I'm not thinking of just now):

	1) By DNIS - give analog customers one number to call, and digital
	customers another one, then discriminate based on which number was
	called.  This is often the simplest and best method.

	2) By CLID - authenticate by CLID as well as by name/pwd (if
	desired) and discriminate based on calling number.  Since this
	tends to require more numbers in your database it can be more
	difficult to manage (one possibile simplification is when the
	proportion of analog/digital calls is very lopsided is to make clid
	auth preferred (not required) and only list the smaller set - in
	your case, the digital customers).  Obviously this requires all of
	your digital customers to supply CLID.

	3) By trunk/line/port.  This probably won't work in your environment,
	since customers could call in on any port.

/joel

> ------------------------------
> 
> From: "Dennis Duval" <skipmax@seacove.net>
> Date: Fri, 17 Mar 2000 18:12:29 -0600
> Subject: (ASCEND) ISDN over 24 Channel T1
> 
> At long last, I have my first ISDN customer trying to connect to my maxen,
> and he is unable to establish a connection.
> 
> I have 3 6096's and 1 4048, all stacked, all configured as close to
> identical as possible.  All of the 14 T1's going into these boxes are
> 24-channel (not PRI -- its not available in this area) . I have one single
> dial-in phone number that rolls into any one of these 336 channels.  Until
> today all my users have been dialing in using analog modems.
> 
> I use Cistron radius for authentication, and have set up nothing unusual in
> the user profile other than to set the Simultaneous-Use = 2
> 
> I was under the impression that my Maxen would be able to differentiate
> between an ISDN call and an analog call and preform the necessary
> negotiations.
> 
> The customer is using a Diva Lan Modem 810-156 provided by the local telco
> (Sprint).  The message returned by this device is: "PPP could not negotiate
> LCP.  Is your username and password present?"  A Sprint technician also
> tried to call in with ISDN and said it would not connect.  He indicated that
> he thought the dial-in line(s?) might not be digital.  I wasn't the one who
> talked to him, so this comes to me second-hand.
> 
> We were able to get this customer connected to our cross-town competitor who
> uses the same type of T1 lines, same Cistron radius, but uses Portmasters
> boxes.
> 
> Does any one have any ideas what I may have overlooked?
> 
> Thanks for the help!
> 
> Dennis Duval
> 
> 
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-- 
joel wittenberg
InterNetworking Systems
joelw@lucent.com

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