Do you mean stop the phone from audibly ringing, but not kick the call to voicemail prematurely? If so, you can also hit the down/minus key on the side (that usually controls volumes). It mutes the ringer, but the phone continues to ring silently until the normal time at which vm kicks in.
Yea I love that mute bottons at the top. Especially handy during work. I have my phone vib twice when recieveing a call, if I don't feel the vibs, I can still mute the actual tone pretty quick from my pocket.
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