Unable to post the data using GPRS - gsm

Question

I am trying to send the data using GPRS sim800a but I am getting network error , before executing the AT+SAPBR=1,1.Signal strength will be good but as soon as AT+SAPBR=1,1 is executed, led starts blinking continuously and returns response code 601.I am using putty terminal.
Can anyone please help me how to resolve this issue? Here is the AT commands used and the responses I got
AT
OK
AT+CGATT=1
OK
AT+SAPBR=3,1,"Contype","GPRS"
OK
AT+SAPBR=3,1,"APN","airtelgprs.com"
OK
AT+SAPBR=1,1
OK
AT+HTTPINIT
OK
AT+HTTPPARA="CID",1
OK
AT+HTTPPARA="URL","IP/path:PORT"
OK
AT+HTTPPARA="CONTENT","application/json"
OK
AT+HTTPPARA="USERDATA","'X-M2M-Origin': "S006"\\r\\n 'Content-Type':'application/json;ty=4'\\r\\n 'Cache-Control':'no-cache'\\r\\n 'Accept':'application/json'"
OK
AT+HTTPDATA=30,80000
DOWNLOAD
{
"m2m:cin":{
"con":"FIRE"}
}
ok
AT+HTTPACTION=1
ok
+HTTPACTION:1,601,0