Grouped Key line configuration and connection to the pin connector:
Keypad Outer Core layer:
Line 1 connected to pin number 10 - Volume up, 1, 2, 3, Right soft key
Line 2 connected to pin number 8 - Volume down, 4, 5, 6, Left soft key
Line 3 connected to pin number 7 - 7, 8, 9, clear key
Line 4 connected to pin number 13 - Navigation select, *, 0, #, Application key
Line 5 connected to pin number 14 - Navigation up, Send, Camera, Navigation down
Line 6 connected to pin number 20 - Navigation right, Music key1, Music key2, Music key3, Navigation left