Receive data using me 3000 gsm/gprs modem

hi,

i want to receive data send by one modem using another mode.But am not getting.please help me...............................

are you sending SMS text messages or TCP/IP packets. Text messages should be no problem but TCP/IP can have problems if the modems are behind different NAT boxes.

HI,
I decided to send it as tcp/ip packets.I don't for that which command i have to use?I am connecting one modem to one pc then other to second pc,in each modem i inserted Tatadocomo sim which is gprs activated.This is the commands that i have used in the sender side:

SENDER
at
ok
at+cgclass?
cg
at+cgatt=1
ok
at+zpnum="TATA.DOCOMO.DIVE.IN"
ok
AT+ZPPPOPEN
+ZPPPOPEN:CONNECTED
OK
AT+ZPPPOPEN
+ZPPPOPEN: ESTABLISHED
OK
AT+ZIPSETUP=1, 10.124.94.7,8080//Proxy ip address and port no: of DOCOMO
+ZIPSETUP:CONNECTED
OK
AT+ZIPSETUP=1,10.125.131.127,8080//IP address of the receiver module.
+ZIPSETUP:ESTABLISHED
OK
AT+ZIPSEND=1,10
>abcdefghij<CR>
+ZIPSNED:OK
OK

RECEIVER
at
ok
at+cgclass?
cg
at+cgatt=1
ok
at+zpnum="TATA.DOCOMO.DIVE.IN"
ok
AT+ZPPPOPEN
+ZPPPOPEN:CONNECTED
OK
AT+ZPPPOPEN
+ZPPPOPEN: ESTABLISHED
OK
AT+ZIPSETUP=1, 10.124.94.7,8080//Proxy ip address and port no: of DOCOMO
+ZIPSETUP:CONNECTED
OK
AT+ZIPSETUP=1,10.125.131.127,8080//IP address of the receiver module.
+ZIPSETUP:ESTABLISHED
OK

After all these am not getting the data that i had send.Any one can solve this .Then what you mean NAT boxes?iI didn't get it.
Please help me................................................