Yealink SIP-T48S User Manual page 203

If there is insufficient free space (less than 30 minutes) on the USB flash drive during
-
recording, the LCD screen prompts the following:
Tap Cancel to return to the previous screen.
If there is insufficient free space (less than 10 minutes) on the USB flash drive during
-
recording, the LCD screen prompts the following:
Tap the Cancel soft key to return to the previous screen.
If no free space of the USB flash drive during recording, recording is stopped and saved on the
USB flash drive automatically. The related soft keys during recording disappear. You cannot
record a call unless the space of your USB flash drive is released.
Note You can transfer or set up a conference call while recording. All the calls are recorded in the same
way and will be saved in as a ".wav" file.
When you end a call while recording, the recording will be stopped and saved as *.wav file on
the USB flash drive automatically.
Advanced Phone Features
193