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The phone you have doenst have a manual in English on the vendors website, however there is a similar model where the manual can be found here.
The principles for using the answer phone are very close to that of TCD962, please refer to section 4, page 38 which lists how to use the answer phone.
To perform a factory rest please see page 37, which will clear all the phone and base station settings.
Please let me know if you need anything clarified