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Click the menu icon in the bottom right of MiCollab and select Transfer.

Use the search bar in the Transfer window to type in a number, then click the Blind Transfer icon in the lower right.

During a call, you can mute your microphone using the microphone icon in the bottom left of MiCollab. If you have another window selected, you can use the microphone button In-Call pop-up window to mute instead.

Alternatively, you can put the customer on hold using the pause button in MiCollab.
You will not be able to hear the customer after they are put on hold.