Unexpected "Expect timeout" in chat script (ppp -auto)

[Andrew C <andrewc6l_(_at_)_yahoo_(_dot_)_com>]

I'm running PPP 3.1 (/usr/sbin/ppp) on OpenBSD 3.7 / i386. Every now
and then, I run into a problem in which the chat script stops working
in -auto mode:

Dec 20 20:45:05 wally ppp[20296]: tun0: Physical: write
Dec 20 20:45:05 wally ppp[20296]: tun0: Physical:  41 54 44 54 36 32 33
37 30 37
 31 30 32 36 0d     ATDT6237071026.
Dec 20 20:45:08 wally ppp[20296]: tun0: Chat: Expect(650): CONNECT
115200
Dec 20 20:45:21 wally ppp[20296]: tun0: Chat: Expect timeout
Dec 20 20:45:21 wally ppp[20296]: tun0: Warning: Chat script failed
Dec 20 20:45:21 wally ppp[20296]: tun0: Phase: deflink: dial -> hangup

I'm using the following dial commnad:

 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 650 \"\" AT OK-AT-OK
ATM1L1E0Q0
 OK \\dATDT\\T CONNECT\\s115200"

As I understand TIMEOUT, my machine should be sitting around for up to
650 seconds before it times out. So why is it timing out in 13 seconds?

If I go to terminal mode and let the modem connect manually, the rest
of the chat script works fine.

What key fact am I missing?

Many thanks!

    Andrew Jr.
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