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Hello, i have a project where i have connected v570 to a wavecom gsm modem. The gsm modem sends alarm messages for liquid gas levels. There is option if you send sms to the modem, it will send you feedback (status) message with all the measured parameters. After few days working the system stops sending messages. If I send sms to the modem i get the confirmation that the sms is received, but i don't get the feedback message. If I restart the PLC and the modem it will work few days and then the problem occurs again. During the problem the modem isn't busy.