Telit HE910-NAD Module GPRS Activation Problem from MCU

Hi All.

I am passing very hard time with my Telit Module to activate the GPRS from MCU UART.

I know the EasyGPRS AT Commands to Activate GPRS and send UDP Data. The strange issue is ... when I an sending the AT Command manuallly by typing from PC Hyper-Terminal then all works. Module can send UDP Data to Server. But when I am sending exact same AT Commands from MCU UART then Module reply ERROR against AT#SGACT=1,1,"","".

Below are my Command which I tried with Module Response (with Echo ON):

AT
OK

AT+CMEE=2
OK

AT&K0
OK

AT+CGDCONT=1,"IP","internet","0.0.0.0",0,0
OK

AT#SGACT=1,1,"",""
+CME ERROR: activation failed

AT#SD=1,1,"31000","110.50.103.97",0,0
+CME ERROR: operation not supported

HELLO
+++

I tried the regular GPRS AT Command as well. Then same ERROR comes with AT#GPRS=1 Command.

Note: The problem only happens when I can sending the Command from MCU. Exact same Command working fine when sending from PC Hyper-Terminal ...

Anyone can advise whats the issue?

Thanks in advance.

Regards.