(ASCEND) CBCP dialback failing modem negotiation? Bug?

["McNamara, Michael" <McNamaraM@MLHS.ORG>]

> Hi,
> 
> I have a MAX 4004 that been running for a while. It's running 6.1.7
> with two PRI lines and has a single 12port K56 digital modem card.
> It's been running very good for the past year.. answering ISDN and
> analog calls with no problems.  Recently I was requested to implement
> dialback for a number of our end-users.  I retrieved your document on
> configuring CBCP
> (http://aos.ascend.com/RightSite/getcontent/test.htm?DMW_OBJECTID=0900
> 05d680002ac4) and followed it to the letter.  Everything appears to be
> configured properly and things work great until the MAX dials back the
> originating modem and they completely fail to negotiate and I mean
> really fail.
> 
> What's odd about this is that if I launch a TS session on the MAX,
> open say modem port 3:3, then atdt <trunkgroup><phone number>, the
> connect goes through with no trouble, clear 53.3Kbs connections and
> the negotiations sound the same as if I was dialing in.  I've swapped
> the client modem with all sorts; USR V.Everything, Toshiba Laptop
> internal, and an Optima 33.6. It doesn't appear to be the client
> modem, neither does it appear to be the quality of the phone line, I
> tested by using a POTS port on another Pipeline 75 router for a truely
> clear connection.
> 
> I've checked the following;
> 
> CBCP Enable=Yes
> CBCP Mode=User Num
> CBCP Trunk Group=8
> Call Type=Switched
> Data Svc=Modem
> Dialout OK=Yes
> 
> Use Trunk Grps=Yes
> Analog Encoding=u-Law
> 
> I've even tried playing around with the following settings;
> 
> Max Baud=28800	(was 33600)
> MDM Modulation=V.34	(was v.90)
> MDM Trn Level=-16	(was -13)
> 
> Any hints, ideas or solutions you could give me would be most
> appreciated!
> 
> Thank you,
> 
> ---
>      Michael F. McNamara
>      Sr. Network Engineer
>      Jefferson Health System
>      (610) 992-2312
>      (610) 640-8357 Pager
>      (610) 251-2127 Fax
>      McNamaraM@mlhs.org
> 
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