Hello there,
Call forwarding is a feature of PABX and Public Exchange systems so do you mean the phone rings once and then 'forwards' to another different telephone number ? If so, then you need to contact the company / person controlling your Lines as you cannot change this on your phone.
If you mean that the phone rings once and then goes on to Answerphone, then this is down to the setting of 'ring count' which is on page 40 of your user manual downloadable here http://www.manualslib.com/manual/117136/Panasonic-Kx-Tg2431.html
If this doesnt answer your question, these please ask again and try and give us more information to help you.
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