Hi Jonathan. Welcome to justanswer.
If you have forgotten your system PIN, you can reset the base to the original code 0000:
Disconnect the power cable from the base.
Hold down the registration/paging key on the base while reconnecting the power cable to the base. Hold down the key for at
least 5 seconds.
The base has now been reset and the system PIN set to 0000
For resetting the device:
Press Menu-Settings-System-Base Reset-Yes- Press the display key
The registration/paging key is the one which is on the base unit and the display key is the first key from the top left (just below the screen)
Can you confirm the model of your Gigaset phone once again?
I am sorry. I thought your model was C300.
The reset process is simple for C300H.
Just Press MENU-SETTINGS-SYSTEM-RESET HANDSET. Then press OK to confirm
You have to do the same procedure on the main base unit as well to reset. The paging key is the one with speaker/wifi kind of a sign. The first key out of the 8 keys present.
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Thanks for the ratings Jonathan. Have a good day.