Been asked this quite a bit
Cytown phone it the primary phone app used in CM - all credit goes to Cytown
Details and the original post for the modified phone app can be found on XDA
The added options as listed on the XDA thread
- add notification differ than talking when dialing.
- vibrate on outgoing call on answered.
- vibrate on 45 sec when outgoing talking, i.e. 45", 1'45", 2'45"... (also have attached without this function.)
- 2 short vibrate on off hook.
- more awake time for screen on while talking.(Method from derfolo)
- notify with led blink when missing call
- vibrate on call waiting
- force return to call log screen after a call out end
- settings for on/off of all above
- show avatar when outgoing call not answered
- ringer performance improved with method from itp@xda.
- show organization in call screen, request by pascanu@xda
- larger avatar
- black list!
- layout from eclair
- force use touch ui keyboard
- turn over to silence incoming phone
- support left hand user
- support wire control to hangup
- show nickname in call screen