Anritsu FAQs
How does the MT8820A show whether or not the MX882000B-01 W-CDMA VOICE CODEC option is installed?
On the Parameter screen, press the [Audio] key. If the option"Handset" is available in the [AF] of Audio Input/Output, the option is installed. There should also be a sticker on the outside of the unit on the rear panel that shows that the option is installed.