The amount of rings before a call goes to voicemail is setup on the network itself and not the phone. Some mobile providers won't let you modify it and others will depending on your region. You would have to call your mobile provider for the availability of the option and the procedures. Sometimes you dial a number to change it other times it can only be changed manually by the provider.
You are asking about changing you voice mail and phone system settings. Your phone can work on several different Panasonic phone systems and you could have different voice mail systems as well.
The phone KX-T7633 has only a user guide that covers the basic features of the phone itself. You need a programming and installation manual for your phone system AND your voice mail. They are not the same part and have different manuals.
So, your first step is to find out the model number of your phone system and voice mail system.
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