第一種
[root@hornic ppp]# pppd call gprs
timeout set to 15 seconds
abort on (DELAYED)
abort on (BUSY)
abort on (ERROR)
abort on (NO DIALTONE)
abort on (NO CARRIER)
timeout set to 40 seconds
send (^MAT^M)
expect (OK)
AT^M^M
OK
 -- got it

send (ATS0=0^M)
expect (OK)
^M
ATS0=0^M^M
OK
 -- got it

send (ATE0V1^M)
expect (OK)
^M
ATE0V1^M^M
OK
 -- got it

send (AT+CGDCONT=1,"IP","INTERNET"^M)
expect (OK)
^M
^M
OK
 -- got it

send (ATDT*99***1#^M)
expect (CONNECT)
^M
^M
ERROR
 -- failed
Failed (ERROR)
Connect script failed

第二種
[root@hornic ppp]# ./ppp-on
BEGIN
Serial connection established.ection at any stage!
using channel 5
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xfefd07ba> <pcomp> <accomp>]
LCP: timeout sending Config-Requests
Connection terminated.
Modem hangup