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Modem hangup

Hi,

I am working on pppd dialer and i am call pppd call gprs. every thing goes fine and finally i am getting connection terminated, modem hangup.

i am pasteing here for your reference.

/etc/ppp # pppd call gprs&                                                      
/etc/ppp # Press CTRL-C to close the connection at any stage!                   
defining PDP context...                                                         
                                                                                
EXT: O                                                                          
                                                                                
OK                                                                              
AT                                                                              
OK                                                                              
ATZ                                                                             
OK                                                                              
AT$APNSRV="airtelgprs.com"                                                      
OK                                                                              
AT$APNUSR="username"                                                            
OK                                                                              
AT$APNPASS="password"                                                           
OK                                                                              
AT$CONNSTART                                                                    
"223.190.148.180"                                                               
                                                                                
Ok_Info_GprsActivation                                                          
                                                                                
OK                                                                              
ATZ                                                                             
OK                                                                              
AT+CGDCONT=1,"IP","airtelgprs.com",,0,0                                         
OK                                                                              
Script /etc/ppp/peers/gprs-connect-airtel finished (pid 902), status = 0x0      
Serial connection established.                                                  
using channel 6                                                                 
Using interface ppp0                                                            
Connect: ppp0 <--> /dev/ttyS2                                                   
rcvd [LCP ConfReq id=0x10 <asyncmap 0x0> <auth chap MD5> <pcomp> <accomp>]      
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x3bde5e65>]                     
No auth is possible                                                             
sent [LCP ConfRej id=0x10 <auth chap MD5> <pcomp> <accomp>]                     
rcvd [LCP ConfRej id=0x1 <magic 0x3bde5e65>]                                    
sent [LCP ConfReq id=0x2 <asyncmap 0x0>]                                        
rcvd [LCP ConfReq id=0x11 <asyncmap 0x0>]                                       
sent [LCP ConfAck id=0x11 <asyncmap 0x0>]                                       
rcvd [LCP ConfAck id=0x2 <asyncmap 0x0>]                                        
sent [LCP EchoReq id=0x0 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [CHAP Challenge id=0x33 <ca4dde053effad78ed6cd4f6d3e9ffe97af3d91acfd84a47c]
rcvd [LCP EchoRep id=0x0 magic=0x0]                                             
rcvd [CHAP Challenge id=0x34 <28060a46770aeac58c343469e7a220b7bcc65b6ba29c93100]
sent [LCP EchoReq id=0x1 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP EchoRep id=0x1 magic=0x0]                                             
rcvd [CHAP Challenge id=0x35 <e3d546c437aebb6eb589c3e9184ce97485fa2d5a5388b4349]
rcvd [CHAP Challenge id=0x36 <47bee3ead5a23d2f2328c670e50ef87f15d7fec97e6a24530]
sent [LCP EchoReq id=0x2 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP EchoRep id=0x2 magic=0x0]                                             
rcvd [CHAP Challenge id=0x37 <3352ffba3d057a297af0c42326e2809bffdc9201375c79723]
sent [LCP EchoReq id=0x3 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP EchoRep id=0x3 magic=0x0]                                             
rcvd [CHAP Challenge id=0x38 <59744c5e7efb854c0dd1be992271d4c41648a78a76fe7514c]
rcvd [CHAP Challenge id=0x39 <6604856741fb507607af44129b7d0d0268c326de612a3a35c]
sent [LCP EchoReq id=0x4 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP EchoRep id=0x4 magic=0x0]                                             
rcvd [CHAP Challenge id=0x3a <284340c845839b5218e65e0e5e77724f1efe4ef8>, name =]
rcvd [CHAP Challenge id=0x3b <5259a65262029cee01a1720a750c7defbef9fd56a61709eb8]
sent [LCP EchoReq id=0x5 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP EchoRep id=0x5 magic=0x0]                                             
rcvd [CHAP Challenge id=0x3c <6b1b1ec05c4c9c5d6b793e740dfde27e1855fe131e4659f38]
sent [LCP EchoReq id=0x6 magic=0x0]                                             
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]   
rcvd [LCP TermReq id=0xb cf 0a]                                                 
LCP terminated by peer (M-O^J)                                                  
sent [LCP TermAck id=0xb]                                                       
Connection terminated.                                                          
Failedding break                                                                
Script /etc/ppp/peers/gprs-airtel-disconnect-chat finished (pid 919), status = 3
disconnect script failed                                                        
Modem hangup                                                                    
                                                                                
/etc/ppp #

could you help.

Thanks advance

raghava