tone recognition


I am writing on behalf of my bosses who both have smart phones and have experienced what we believe to be tone recognition problems when they call from their smart phones into our office to check their office phone's voicemails.  I contacted our phone system service department who said there are issues with several phone systems recognizing Verizon's tones.  He also said that he has not heard of this issue with other providers.  Is there anyone else out there who has experienced this?

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