That's a great question msgtedret. Unfortunately, we do not have a way to extend the amount of rings before the calls go to voicemail. Was there a particular reason why you were looking to extend the amount of rings before going to voicemail?
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I also have this problem. When my phone rings, I hardly ever have time to get to my phone before it has hung up on the caller (or let them leave voicemail). It only rings 3 or 4 times. This is much shorter than any other phone I've ever had. Surely there is a way to extend this.
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I can definitely clarify the details about Voicemail, and how long the phone rings when someone calls you. All lines are set to a 30-second ringtime, which normally comes out to between -6 rings (one ring every 5 seconds, approximately). If you're in a location where your signal is weaker, it can take the phone longer to start ringing, which also lowers the amount of rings. I recommend making sure you power your phone off and on every couple of days. That keeps the registration "fresh" between the phone and the network. Please give that a try and monitor it, to see if you get another ring or two before Voicemail picks up.