usr sportster pro not always properly detected

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I recently bought an external USR voice modem. Particulars:
ati7
Configuration Profile...

Product type           US/Canada External
Product ID:            00560500
Options                V32bis,V.34+,v.80,x2,V.90
Fax Options            Class 1/Class 2.0
Line Options           Caller ID, Distinctive Ring
Voice Options          Speakerphone, TAD
Clock Freq             96.0Mhz
EPROM                  256k
RAM                    32k

FLASH date             11/17/98
FLASH rev              4.9.2

DSP date               11/17/98
DSP rev                4.9.2

USB date               11/13/98

OK

I am using this init-chat string in my mgetty.config:
ATE1Q0S0=0S13.2=1&D3

I am running mgetty v1.2.21 with the most recent patch applied as of
1999-10-09 on a debian slink distribution running the linux kernel
v2.2.13pre17. Current debug level in mgetty.config and voice.conf is 5.

Very rarely I see this beautiful message in the vg_ttyS1.log:
10/23 09:10:36 yS1  detecting voice modem type
10/23 09:10:36 yS1   voice command: 'ATI9' -> ''
10/23 09:10:37 yS1   voice command: 'ATI' -> ''
10/23 09:10:37 yS1  US Robotics detected

But usually I see this:
10/23 09:33:26 yS1  detecting voice modem type
10/23 09:33:27 yS1   voice command: 'ATI9' -> ''
10/23 09:33:28 yS1   voice command: 'ATI' -> ''
10/23 09:33:28 yS1  no voice modem detected

I am using a connect speed of 38400 (really, not 115k) per a suggestion in an
older mailing list archive but if I use any speed from 38.4k through 115k I see
the same behavior. I am willing to dig deeper into this problem but I was
hoping that someone else had run into this or could at least direct me to
where I should be looking to fix this issue.

E