I'm in US. I just received the 1921 cable phone. Our phone line is through internet. When a call comes in the phone rings a half a ring then stops. It won't ring fully. Incoming calls are not always connecting. Outgoing calls are fine.
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normally all our telephones should ring on cable/internet routers without any problems. Can you tell us briefly which Internet/telephone router your Opis 1921 phone is connected to? With this information we can help you solve the problem or send you a replacement phone if necessary.