Here are some flows of a SIP & SCCP phone call. My purpose was to see is it really only digit-by-digit dialing even when the phone is on hook.
SCCP
on-hook dialing : EnBloc
off-hook dialing : Digit by Digit
SIP
type B on-hook dialing no dial-rules : EnBloc
type B off-hook dialing no dial-rules : Digit by Digit with KPML event