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 the call
setup process of this call is true?

A.
Each digit will arrive at Cisco Unified Communications Manager in a SIP NOTIFY message as a KPML
event, and Cisco Unified Communications Manager will extend the call as soon as the collected digits
match the extension of the SCCP IP phone, bypassing class of service configuration on both IP phones.

B.
Each digit will arrive at Cisco Unified Communications Manager in a SIP NOTIFY message as a KPML
event. When the collected digits match the extension of the SCCP IP phone, Cisco Unified Communications
Manager
will extend the call only if the class of service configuration on both phones permits this action.

C.
As soon as the user selects the Dial softkey, the SIP IP phone will forward all digits to Cisco Unified
Communications Manager in a SIP INVITE message. Cisco Unified Communications Manager will extend
the call as soon as the collected digits match the extension of the SCCP IP phone, bypassing class of service
configuration on both IP phones.

D.
As soon as the user selects the Dial softkey, the SIP IP phone will forward all digits to Cisco Unified
Communications Manager in a SIP INVITE message. Cisco Unified Communications Manager will extend
the call only if class of service configuration on both phones permits this action.

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. Cisco Unified Communications Manager will extend
the call as soon as the collected digits match the extension of the SCCP IP phone, bypassing class of
service configuration on both IP phones.

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.