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Unable to make Audio / Video call using Skype for Business (Lync) client.

Issue: Unable to make Audio / Video call using Skype for Business (Lync) client.
When you make Skype for Business (Lync) call which is VoIP call. So sometimes Skype for Business (Lync) computer audio doesn't work because of various reasons, for example, because drivers are missing, audio devices are incompatible, or a step was missed during set up.
Here are the most common audio problems:
1.     Unable to hear other party:
In the Skype for Business (Lync) call / Meeting, point to the Phone/Mic button as Skype/Lync Mic button and then click the DEVICES tab. make sure the device you want is selected.
Check the speaker volume on your computer as well. Click the speaker (icon Windows) sound button on your taskbar, (usually on the lower-right corner of your computer). Then use the slider to change the volume of the device you selected and set as high.
Note: If your device is connected to a USB hub, connect it directly to your computer.
2.     Other party cannot hear you:
Check to make sure you’re not muted. When you’re muted, the Phone/Mic button in the meeting looks like
3.     Skype for Business (Lync) doesn’t recognize your audio device, or you get an error: "Your speaker and microphone are not working"
Try below:
1)    If your audio device is connected to a USB hub, plug it directly into your computer.
2)    Unplug your device, reboot, and plug it back in.
3)    Make sure your audio device is not disabled:
a.     Go to Start > Control panel.
b.     In Control panel, search for Sound and open it.
c.      Right-click to make sure the Show Disabled Devices check box is elected.
d.     If your audio device is disabled, right-click the device and click Enable.
4)    If you attached new device and not showing then scan for hardware changes in Device Manager:
a.     Go to Start > Control panel.
b.     Search for Device Manager, and then open it.
c.      Select your computer name, and then click Action > Scan for hardware changes. This will find new devices and install the drivers.
5)    Download the most current drivers from the manufacturer’s website and install them. This is very important to have latest drivers.
4.     Unable to hear sound using Skype (Lync) however hear using computer sounds through your desk phone.
This can happen if you set up your desk phone as the default audio device in Windows, instead of in Skype for Business (Lync).
a.     Check your default Windows audio device.
b.     Click Start, and then type Sound in the Search programs and files box.
c.      Click Sound on the menu.
d.     On the Playback tab, right-click another device, such as your computer speaker or a headset, and then click Set as Default Device.
5.     If you Error message notifications.
In some cases, Skype for Business (Lync) displays a notification about audio in the conversation window or the Skype for Business (Lync) main window. Click the notification for more information or suggested solutions and send error to you IT support team.
6.     Unsupported audio device.
Most of the time audio issue is related to device. If you are using your own audio (USB) device then disconnect device and use computer Speaker/ Mic and see if you are able to complete call.
7.     Call connects and drop instantly or after few second.
This issue might be due to windows firewall blocking communication or port.
Try to stop your windows firewall service and make test call.
Start > Run > Services.msc > find ‘Windows Firewall’ service and right client on it say Stop. Refer below screenshot.
8.     If still issue persist then there may be issue from server side, firewall side, LB side. You can generate log using reproducing issue and send it to you Support team.
Thank you.


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