I use debain linux
I too tried wvdial the same problem

[murali@localhost]pppd call gprs
Press CTRL-C to close the connection at any stage!
defining PDP context...
~AT
OK
ATZ
OK
ATE1
OK
AT+CGDCONT=1,"IP","airtelgprs.com",,0,0
OK
waiting for connect...

ATD*99#
CONNECT
Connected.
If the following ppp negotiations fail,
try restarting the phone.

Serial connection established.
using channel 6
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
rcvd [LCP ConfReq id=0x0 <auth pap> <mru 1500> <asyncmap 0xa0000>]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2b534129>]
sent [LCP ConfAck id=0x0 <auth pap> <mru 1500> <asyncmap 0xa0000>]
rcvd [LCP ConfRej id=0x1 <magic 0x2b534129>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0>]
rcvd [LCP ConfAck id=0x2 <asyncmap 0x0>]
sent [LCP EchoReq id=0x0 magic=0x0]
sent [PAP AuthReq id=0x1 user="murali" password="jack"]
rcvd [LCP EchoRep id=0x0 magic=0x0]
rcvd [PAP AuthAck id=0x1 ""]
PAP authentication succeeded
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15>]
sent [IPCP ConfReq id=0x1 <addr 30.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfReq id=0x0 <addr 10.6.6.6>]
sent [IPCP ConfAck id=0x0 <addr 10.6.6.6>]
rcvd [LCP ProtRej id=0x0 80 fd 01 01 00 0c 1a 04 78 00 18 04 78 00]
Protocol-Reject for 'Compression Control Protocol' (0x80fd) received
sent [LCP EchoReq id=0x1 magic=0x0]
rcvd [LCP TermReq id=0x1]
LCP terminated by peer
sent [LCP TermAck id=0x1]
rcvd [LCP EchoRep id=0x1 magic=0x0]
Connection terminated.

Sending break to the modem

PDP context detached
Serial link disconnected.
Modem hangup

========The chat scripts gprs i used ==============
# Most GPRS phones don't reply to LCP echo's
lcp-echo-failure 1
lcp-echo-interval 1

# Keep pppd attached to the terminal:
# Comment this to get daemon mode pppd
nodetach

# Debug info from pppd:
# Comment this off, if you don't need more info
debug

# Show password in debug messages
show-password

# Connect script:
# scripts to initialize the GPRS modem and start the connection,
connect /etc/ppp/peers/gprs-connect-chat

# Disconnect script:
# AT commands used to 'hangup' the GPRS connection.
disconnect /etc/ppp/peers/gprs-disconnect-chat

# Serial device to which the GPRS phone is connected:
/dev/ttyUSB0 # Bluetooth serial port one

# Serial port line speed
230400 # fast enough1

# Hardware flow control:
# Use hardware flow control with cable, Bluetooth and USB but not with IrDA.
crtscts # serial cable, Bluetooth and USB, on some occations with IrDA too
#nocrtscts # IrDA

# Ignore carrier detect signal from the modem:
local

# IP addresses:
# - accept peers idea of our local address and set address peer as 10.0.0.1
# (any address would do, since IPCP gives 0.0.0.0 to it)
# - if you use the 10. network at home or something and pppd rejects it,
# change the address to something else
30.0.0.0:0.0.0.0

# pppd must not propose any IP address to the peer!
noipdefault

# Accept peers idea of our local address
ipcp-accept-local

# Add the ppp interface as default route to the IP routing table
defaultroute

# DNS servers from the phone:
# some phones support this, some don't.
usepeerdns

# ppp compression:
# ppp compression may be used between the phone and the pppd, but the
# serial connection is usually not the bottleneck in GPRS, so the
# compression is useless (and with some phones need to disabled before
# the LCP negotiations succeed).
novj
nobsdcomp
novjccomp
nopcomp
noaccomp

# The phone is not required to authenticate:
noauth

# Username and password:
# If username and password are required by the APN, put here the username
# and put the username-password combination to the secrets file:
# /etc/ppp/pap-secrets for PAP and /etc/ppp/chap-secrets for CHAP
# authentication. See pppd man pages for details.
user murali
password jack

#
mtu 1500
mru 1500


=================== gprs-connect-chat=======================

#!/bin/sh
#
# $Id: gprs-connect-chat,v 1.2 2004/02/02 23:19:28 mcfrisk Exp $
#
# File:
# gprs-connect-chat
#
# Description:
# chat script to open Saunalahti's GPRS service with GPRS phones. If ppp
# negotiation stalls, try restarting the phone. To try with other GPRS
# operator setting, change the PDP contex setting. The settings work with
# most Ericsson models, but Nokia 8310 and 30 do not support QoS parameters
# with AT commands, so just delete those lines and it'll work.
#
# Set PDP context CID=1, protocol=IP, APN=internet:
# AT+CGDCONT=1,"IP","airtelgprs.com","",0,0
#
# Set CID=1 QoS requirements from the network, not supported by Nokia:
# AT+CGQREQ=1,0,0,0,0,0
#
# Set CID=1 minimum acceptable QoS parameters, not supported by Nokia:
# AT+CGQMIN=1,0,0,0,0,0
#
# 'Call' CID=1 (activate PDP context one, perform GPRS attach):
# ATD*99***1#
#
# Some phones like the Orange SPV (yes, the Microsoft Smartphone) use this
# dial string to start GPRS connection:
# ATD*99#
#
# The actual chat script:
exec chat \
TIMEOUT 5 \
ECHO ON \
ABORT '\nBUSY\r' \
ABORT '\nERROR\r' \
ABORT '\nNO ANSWER\r' \
ABORT '\nNO CARRIER\r' \
ABORT '\nNO DIALTONE\r' \
ABORT '\nRINGING\r\n\r\nRINGING\r' \
'' \rAT \
TIMEOUT 12 \
SAY "Press CTRL-C to close the connection at any stage!" \
SAY "\ndefining PDP context...\n" \
OK ATZ \
OK ATE1 \
OK 'AT+CGDCONT=1,"IP","airtelgprs.com"',"",0,0 \
OK ATD*99# \
TIMEOUT 22 \
SAY "\nwaiting for connect...\n" \
CONNECT "" \
SAY "\nConnected." \
SAY "\nIf the following ppp negotiations fail,\n" \
SAY "try restarting the phone.\n"

====================== gprs-disconnect-chat====================
#!/bin/sh
#
# File:
# gprs-disconnect-chat
#
# send break
exec /usr/sbin/chat -V -s -S \
ABORT "BUSY" \
ABORT "ERROR" \
ABORT "NO DIALTONE" \
SAY "\nSending break to the modem\n" \
"" "\K" \
"" "+++ATH" \
SAY "\nPDP context detached\n"

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