Refer to the exhibit.

A user is going through a series of dialing steps on a SIP Type B IP phone (for example, a Cisco 7975)
to call an SCCP IP phone. Both phones are registered to the same Cisco Unified Communications
Manager cluster. Assuming 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 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 Cisco Unified Communications Manager in
a SIP NOTIFY message as a KPML event.

B.
The SIP IP phone will wait for the interdigit timer to expire, and then send each digit to Cisco
Unified Communications Manager as a separate KPML event in a SIP NOTIFY message.

C.
The SIP IP phone will wait for the interdigit timer to expire, or for the Dial softkey to be selected
before sending all digits to Cisco Unified Communications Manager in a SIP INVITE message.

D.
The SIP IP phone will wait for the interdigit timer to expire, or for the Dial softkey to be selected
before sending the first digit in a SIP INVITE and the subsequent digits in SIP INFORMATION
messages.

E.
The SIP IP phone will wait for the interdigit timer to expire, and then send all digits to Cisco
Unified Communications Manager in a SIP INVITE message.

Explanation:
Cisco Type B SIP Phones offer functionality based SIP INVITE Message. Every key the end user
presses triggers an individual SIP message. The first event is communicated with a SIP INVITE, but
subsequent messages use SIP NOTIFY messages. The SIP NOTIFY messages send KPML events
corresponding to any buttons or soft keys pressed by the user. Cisco Type B SIP IP Phones with SIP
dial rules operate in the same manner as Cisco Type A phones with dial rules.