[I do not have my Pebble anymore so do not expect any non-critical updates for this app in the future.]
Dialer for Pebble completely revamps calling controls. It allows you to answer calls, decline calls, toggle speakerphone, toggle mic mute right from your pebble.
You can also place calls right from pebble without even touching your phone, by browsing call history or filtering through contacts and groups.
TURN OFF CALL NOTIFICATION IN ANDROID PEBBLE APP. OTHERWISE THIS WILL NOT WORK PROPERLY.