Linux pppd GPRS拔号问题！

jerrylw

在Red Hat Linux用pppd进行GPRS拔号，AT指令都能通过，但总不能连接，显示“Connect script failed”，实在是对pppd和chat不熟，盼各位XDJM解答。我用的是WISMO Q2406B GPRS模块，PC运行Red Hat Linux9，启动pppd file gprs后，显示如下：
pppd options in effect:
debug # (from /etc/ppp/gprs)
kdebug 7 # (from /etc/ppp/gprs)
nodetach # (from /etc/ppp/gprs)
dump # (from /etc/ppp/gprs)
-chap # (from /etc/ppp/gprs)
user foo # (from /etc/ppp/options)
papcrypt # (from /etc/ppp/gprs)
/dev/ttyS0 # (from /etc/ppp/gprs)
115200 # (from /etc/ppp/gprs)
lock # (from /etc/ppp/options)
connect /etc/ppp/gprs-connect-chat # (from /etc/ppp/gprs)
disconnect /etc/ppp/gprs-disconnect-chat # (from /etc/ppp/gprs)
-crtscts # (from /etc/ppp/gprs)
local # (from /etc/ppp/gprs)
asyncmap 0 # (from /etc/ppp/gprs)
nomagic # (from /etc/ppp/gprs)
mtu 1500 # (from /etc/ppp/gprs)
receive-all # (from /etc/ppp/gprs)
novj # (from /etc/ppp/gprs)
ovjccomp # (from /etc/ppp/gprs)
ipcp-accept-local # (from /etc/ppp/gprs)
ipcp-accept-remote # (from /etc/ppp/gprs)
noipdefault # (from /etc/ppp/gprs)
defaultroute # (from /etc/ppp/gprs)
usepeerdns # (from /etc/ppp/gprs)
: # (from /etc/ppp/gprs)
nodeflate # (from /etc/ppp/gprs)
AT
OK
Press CTRL+C to close the connection at any stage!

defining PDP context...
ATE1
OK
AT+CGATT?
+CGATT: 1
OK
AT+CGATT=1
OK
AT+CGATT?
+CGATT: 1
OK
AT+CGCLASS=B
OK
AT+CGDCONT=1,"IP","CMNET"
OK
AT+CGACT=1,1
OK
ATDT*99***1#
CONNECT 115200
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Connect script failed