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.