What is communication error 20 mean ?
The Comm. Error message may appear if the machine experienced a communication error while sending or receiving a message. This type of error is generally caused by interference on the telephone line, an incorrect telephone line connection, or an alarm system or other device on the line. In your case, it lost connection to the host / server. You just need to keep retrying or check the settings on the phone and confirm with the vendor if they have changed some settings on their end...such as PORT #, etc...
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