MiCollab will use your device’s Default Communication Device for audio. You can see which device your MiCollab Softphone is using by clicking on the cog icon as shown below:
The MS Windows Default Communication Device can be changed as follows:
On some occasion, applications like Microsoft Teams can take exclusive use of an audio device (headset) preventing it being used by other applications, including the MiCollab Softphone.
This can be resolved with the following steps: