Yealink T48S Skype For Business Edition User Manual page 182

User Guide for the T48S Skype for Business phone
If you insert a USB flash drive to the phone when the phone is idle, the phone will detect the
USB flash drive and display a flashing USB icon. After detecting the USB flash drive, the icon
stops flashing and a message will display on the screen:
If you insert a USB flash drive to the phone during a call, a message will pop up to tell you how
much time is available for recording. For more information on the available recording time,
refer to Viewing the Storage Space
Note
The size of a single recording file should be less than 2G.
The Start REC soft key controls the recording function, and is available:
When the free space of USB flash drive is sufficient

When there are one or more calls connected to your phone

During an active call

When calls are on hold or muted

During a consultative transfer

During a conference call

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on page 186.