Problem with GSM Modem

Problem with GSM Modem

Hi,
I have a problem with GSM Modem. Every 10-15 minuets when I try to send test SMS message I see error "SMS Sending failed because of Invalid Modem gateway". When I connect to modem via hyper terminal or SiMoCo modem works fine.

How I can resolve this issue?

Regards,
Anton

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