Try the following solutions to resolve the issues. These issues are often due to your router's firewall (also known as NAT) blocking certain operations of the VoIP telephone adapter. You experience quality issues such as choppy conversation or one person can't hear the other.Your calls have a maximum duration of exactly 10 minutes.You hear a busy signal in the middle of the call.Incoming calls go directly to voicemail without ringing your VoIP VoIP phone.You cannot make outbound calls or when making outbound calls you hear a busy signal even though the person you are calling hears a ring.VoIP light goes out intermittently or constantly.If your VoIP telephone adapter is placed behind a router or a combined modem/router, you may experience problems with your VoIPVoIP service.
