Yealink SIP-T48G Administrator's Manual page 51

To connect the extension microphones:
1) Connect the free end of the optional extension microphone cable to one of the MIC
ports on the phone.
5. Connect the optional USB flash drive (only applicable to CP860 IP phones):
You can connect a USB flash drive to record and play back calls.
To connect a USB flash drive:
1) Insert a USB flash drive into the USB port on the phone.
6. Connect the optional PC or mobile device (only applicable to CP860 IP phones):
You can connect a PC or mobile device to listen to the PC or mobile audio using your
conference phone.
Getting Started
31