Instruction manual
 The AXIS 2191 Audio Module  AXIS 2400+/2401+ Admin Manual
 32 
Using the Audio Module with Your Video Server
Your audio module is now configured and ready for use with your video server. Enter the server’s 
IP-address in Internet Explorer, or click Home on the server’s admin page. You should then see the 
control panel for the AXIS 2191 below the image. If no audio controls are visible, check that you 
have selected the audio module for use on COM2.
Using the Different Audio Modes
Full-Duplex
Full-Duplex mode means that you can transmit and receive audio (talk and listen) at the 
same time, without having to use any of the controls. This is just like having a telephone 
conversation. The only controls you may wish to use are the mute checkboxes to turn off 
the sound, and the level sliders, to adjust the input/output levels. This mode requires a 
full-duplex sound card on your computer. If your available bandwidth is 0.2Mbit/s or less, 
it is recommended that you use Half-Duplex mode instead.
Half-Duplex
Half-Duplex mode also sends and receives audio in both directions, but only in one 
direction at a time. This means you must actively transmit with the help of the 
Push-to-Talk button. To speak, press the button (check that the microphone is not muted). 
When finished speaking, release the button. You will now be receiving audio from the 
other end of the connection. Note that the Push-to-Talk button can be configured for use 
in two different ways - Toggle or Instant. This is set in the server’s admin tools. 
Half-Duplex mode is best if you only have limited bandwidth available.
Push-To-Talk
Used in Half-Duplex or 
Simplex - Talk mode. 
The button’s own 
mode is set in the 
server’s admin pages.
Mute Checkboxes
Check to mute speaker or microphone.
NB. Exactly which controls will be 
visible below the image depends 
on the audio mode you are using. 
For example, the Push-to-Talk 
button will not be visible in 
Full-Duplex mode. Similarly, when 
using Simplex - Listen mode, only 
the Speaker controls will be 
shown. The audio mode is set in 
the server’s admin tools.
Show/Hide Settings
Shows or hides the 
slider controls and 
level indicators. 
Available Bandwidth
Select the bandwidth available 
for your connection.
Level Adjust IN/OUT
Drag sliders to adjust level.










