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sim300 gprs connection problem

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kunal123

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hi,
when i transmit at commands to sim300 gprs module on hyperterminal i got following responce from module

at+cdnscfg="202.56.230.5","202.56.240.5"
RING

OK

RING

RING

RING

RING

RING

RING

RING

RING

RING

RING

RING

NO CARRIER

RING
can anyone describe what the meaning of this

thanks
 

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