If you’re able to hear the voice while video or audio call, visit Speakers/Headset troubleshooter The histogram shows the number of audio calls that had. The rating numbers range from 1 to 5, 1 is the worst and 5 is the best. If through connection troubleshooter, you’ve found out the problem is not in connection, test the following three issues one by one. The other top-level report is called the 'User-reported Call Quality Rating Histogram.' Call Quality Ratings are the numbers given by Skype for Business users at the end of a call to indicate the quality of the call. You can visit their Connection Troubleshooter to check if it’s really causing your poor video conversation or not. It's always batter to first check your connection if you're having issues with call quality. Poor or unstable connections cause a number of problems while Skype to Skype conversations. Some of the hardware and connection problems are given below. If you’re experiencing bad video call quality in Skype to Skype conversation, it’s probably caused by an internetconnection or computer hardware problem. Some of the major reasons are given below. Some of the reasons could be, for example, if you don’t have good quality internet service, you’re lacking internet speed, or there is some problem in connection etc. There may be many reasons behind the bad Skype video call quality experience. So, improving Skype video call quality and one of the basic requirements for the person uses Skype for business, or for home and family conversations. Everyone likes when he calls someone on Skype, a batter quality of audio and video.