Refer to the exhibit.

A user is going through a series of dialing steps on a SIP Type B IP phone to call a SCCP IP phone.
Both phones are registered to the same Cisco Unified Communications Manager cluster. Assume
that the calling SIP phone is associated with a SIP dial rule with a pattern value of “2001”.
Which statement about how digits are forwarded to the Cisco Unified Communications Manager for
further call processing is true?

A.
As each digit is pressed on the SIP IP phone, it is sent to the Cisco Unified Communications
Manager in a SIP NOTIFY message as a KPML event.

B.
The SIP IP phone waits for the inter-digit timer expiry and then sends each digit to the Cisco
Unified Communications Manager as a separate KPML event in a SIP NOTIFY message.

C.
As soon as the user selects the Dial soft key, the SIP IP phone forwards all digits to the Cisco
Unified Communications Manager in a SIP INVITE message.

D.
As soon as the Dial soft key is selected, the SIP IP phone forwards the first digit in a SIP INVITE and
the subsequent digits in SIP INFORMATION messages.

E.
The SIP IP phone waits for the inter-digit timer expiry, and then sends all digits to the Cisco Unified
Communications Manager in a SIP INVITE message.

Explanation:
https://supportforums.cisco.com/document/87236/working-concept-sccp-sip-phonesand-dial-rules.