HELP! administrator manual for Siemens Optipoint 300 basic needed

I'm a student in it-technology and urgently need help in configuering the optipoint 300 basic IP-phone. Does anyone know how to reset the terminal to the factory settings or has a idea where to get the manual? Siemens has no longer support for these ip-phones and this is my problem. Thank you for your help Gunther

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Gunther Conrad
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