GPRS connection problem in GM862

I am trying to send a tcp packet to some server.

After configuring the APN settings I have gone through the following commands:

Sent:AT#SCFG=1,1,300,90,600,50

Received:AT#SCFG=1,1,300,90,600,50

OK

Sent: AT#SGACT=1,1

Received: AT#SGACT=1,1

#SGACT: 10.10.0.23

OK

Sent: AT#SD=1,0,80,“www.roundsolutions.com

Received: AT#SD=1,0,80,“www.roundsolutions.com

after this there is no response at all and I cant execute any other command.

I tried to send : +++

but nothing happens

I also tried :

AT#SD=1,0,80,“www.roundsolutions.com”,255,0

&

AT#SD=1,0,80,“www.roundsolutions.com”,0,0

but its the same .

note: REV ID = 07.02.403

what is going on here ?