PPP says No network protocols running

Hi,
	I am trying to connect to airtel GPRS network using UbiNetics GM800 
module.I am getting the following errors.
Can anybody tell me where i am going wrong.

Thanks in advance,
Ramprasad
Serial connection established.
using channel 3
Using interface ppp0
Connect: ppp0 <--> /dev/rmodem
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xcca87385> <pcomp> <accomp>]
rcvd [LCP ConfRej id=0x1 <magic 0xcca87385>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x9 <auth chap MD5> <pcomp> <accomp>]
sent [LCP ConfNak id=0x9 <auth pap>]
rcvd [LCP ConfReq id=0xa <auth pap> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <auth pap> <pcomp> <accomp>]
sent [PAP AuthReq id=0x1 user="98454*****" password=<hidden>]
rcvd [PAP AuthAck id=0x1 ""]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 
0.0.0.0>]
IPCP: timeout sending Config-Requests
sent [LCP TermReq id=0x3 "No network protocols running"]
rcvd [LCP TermAck id=0x3 "No network protocols running"]
Connection terminated.