[SOLVED] FTP Communication using PC and SIM300??

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I have to send data over FTP using SIM300.
I don't have any idea regarding networking..

I dont know which ftp site to use.
Thats why i use ftp.microchip.com

but not able to get what to do with this.
as i cant read any file or send any file to that site.

Please suggest me something regarding this topic..

AT+CIPSHUT
SHUT OK
AT+CLPORT="TCP","2021"
OK
AT+CLPORT?
TCP: 2021
UDP: 3030

OK
AT+CGATT=1
OK
AT+CGDCONT=1,"IP","airtelgprs.com"
OK
AT+CDNSCFG="122.160.120.56","202.56.230.7"
OK
AT+CDNSCFG?
PrimaryDns:122.160.120.56
SecondaryDns:202.56.230.7

OK
AT+CSTT="airtelgprs.com","",""
OK
AT+CIICR
OK
AT+CIFSR
106.202.129.64
AT+CIPSTATUS
OK

STATE: IP STATUS
AT+CIPHEAD=1
OK
AT+CDNSORIP=1
OK
AT+CIPSTART="TCP","ftp.microchip.com","21"
OK

CONNECT OK
+IPD27:220 Microsoft FTP Service
> ls

SEND OK
+IPD34:500 'LS': command not understood

I just want to see the contents of the site ftp.microchip.com

Please suggest me something..
I don't know what to do.
I am using SIM300 Module

Thanks in Advance