求助linux下拨号的问题（与以前的有所不同）

我现在在redhat9.0下做ppp脚本拨号，由于我用的不是modem,而是集成了gprs模块的实验箱，所以出了一些问题，请大家指点一下：（硬件没有问题，而且实验箱可以提供gprs与pc的连接）
下面给出log里的提示信息：
Nov 15 15:54:22 lixc pppd[2270]: pppd 2.4.1 started by root, uid 0
Nov 15 15:54:23 lixc chat[2271]: timeout set to 3 seconds
Nov 15 15:54:23 lixc chat[2271]: abort on (\nBUSY\r)
Nov 15 15:54:23 lixc chat[2271]: abort on (\nNO ANSWER\r)
Nov 15 15:54:23 lixc chat[2271]: abort on (\nRINGING\r\n\r\nRINGING\r)
Nov 15 15:54:23 lixc pppd[2270]: Serial connection established.
Nov 15 15:54:24 lixc pppd[2270]: Using interface ppp0
Nov 15 15:54:24 lixc pppd[2270]: Connect: ppp0 <--> /dev/ttyS0
Nov 15 15:54:24 lixc /etc/hotplug/net.agent: assuming ppp0 is already up
Nov 15 15:54:55 lixc pppd[2270]: LCP: timeout sending Config-Requests
Nov 15 15:54:55 lixc pppd[2270]: Connection terminated.
Nov 15 15:54:55 lixc /etc/hotplug/net.agent: NET unregister event not supported
Nov 15 15:54:56 lixc pppd[2270]: Exit.

ppp-on的脚本：
#!/bin/sh
#
# Script to initiate a ppp connection. This is the first part of the
# pair of scripts. This is not a secure pair of scripts as the codes
# are visible with the 'ps' command.  However, it is simple.
#
# These are the parameters. Change as needed.
TELEPHONE=*99***1# # The telephone number for the connection
ACCOUNT=  # The account name for logon (as in 'George Burns')
PASSWORD=  # The password for this account (and 'Gracie Allen')
LOCAL_IP=0.0.0.0 # Local IP address if known. Dynamic = 0.0.0.0
REMOTE_IP=0.0.0.0 # Remote IP address if desired. Normally 0.0.0.0
NETMASK=255.255.255.0 # The proper netmask if needed
#
# Export them so that they will be available at 'ppp-on-dialer' time.
export TELEPHONE ACCOUNT PASSWORD
#
# This is the location of the script which dials the phone and logs
# in.  Please use the absolute file name as the $PATH variable is not
# used on the connect option.  (To do so on a 'root' account would be
# a security hole so don't ask.)
#
DIALER_SCRIPT=/etc/ppp/ppp-on-dialer
#
# Initiate the connection
#
# I put most of the common options on this command. Please, don't
# forget the 'lock' option or some programs such as mgetty will not
# work. The asyncmap and escape will permit the PPP link to work with
# a telnet or rlogin connection. You are welcome to make any changes
# as desired. Don't use the 'defaultroute' option if you currently
# have a default route to an ethernet gateway.
#
exec /usr/sbin/pppd debug lock nocrtscts modem  /dev/ttyS0 19200 \
asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IPREMOTE_IP \
noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT

ppp-off的脚本
#!/bin/sh
######################################################################
#
# Determine the device to be terminated.
#
if [ "$1" = "" ]; then
DEVICE=ppp0
else
DEVICE=$1
fi
######################################################################
#
# If the ppp0 pid file is present then the program is running. Stop it.
if [ -r /var/run/$DEVICE.pid ]; then
        kill -INT `cat /var/run/$DEVICE.pid`
#
# If the kill did not work then there is no process running for this
# pid. It may also mean that the lock file will be left. You may wish
# to delete the lock file at the same time.
        if [ ! "$?" = "0" ]; then
                rm -f /var/run/$DEVICE.pid
                echo "ERROR: Removed stale pid file"
                exit 1
        fi
#
# Success. Let pppd clean up its own junk.
        echo "PP link to $DEVICE terminated."
        exit 0
fi
#
# The ppp process is not running for ppp0
echo "ERROR: PPP link is not active on $DEVICE"
exit 1

ppp-on-dialer的内容：
#!/bin/sh
#
# This is part 2 of the ppp-on script. It will perform the connection
# protocol for the desired connection.
#
exec chat -v      \
TIMEOUT  3    \
ABORT  '\nBUSY\r'   \
ABORT  '\nNO ANSWER\r'   \
ABORT  '\nRINGING\r\n\r\nRINGING\r' \
# ''  \rAT    \
OK         AT    \
OK         ATE0v1    \
OK         AT    \
OK  'AT+CGDCONT=1,"IP","CMNET"'     \
TIMEOUT  30    \
OK  ATDT$TELEPHONE   \
CONNECT  ''    \
ogin:--ogin: $ACCOUNT   \
assword: $PASSWORD