Some people--but not all people--who call me regularly have started experiencing a problem where their calls go directly to my voicemail. That occurs whether they call my Ting number or my Google Voice number. If I make a call to my Ting number from Google Voice on my PC, my android phone rings as it should. Moreover, these same people have been able to contact me in the past. This is a recent problem. Can anyone suggest what the problem may be?