300-070 Question #7: Real Exam Question with Answer & Explanation

The correct answer is B: The phone can detect invalid numbers and play a reorder tone without sending any signaling. SIP dial rules are configured on IP phones to control how dialed digits are handled locally before or while interacting with Cisco Unified Communications Manager. B is correct: dial rules allow the phone to locally validate dialed digits; if a number does not match any valid dial

Question

What are the two benefits of using SIP dial rules on an IP phone? (Choose two)

Options

AThe phone can initiate dialing without sending any signaling messages to Cisco Unified
BThe phone can detect invalid numbers and play a reorder tone without sending any signaling
CIf dialed digits match an entry of a SIP dial rule, the dialed string is sent in a single SIP 200 OK
DIf Cisco Unified Communications Manager requires more digits, KPML can be used to send the
EIf Cisco Unified Communications Manager requires more digits, another en bloc message is used

Explanation

SIP dial rules are configured on IP phones to control how dialed digits are handled locally before or while interacting with Cisco Unified Communications Manager. B is correct: dial rules allow the phone to locally validate dialed digits; if a number does not match any valid dial rule pattern, the phone can play a reorder tone immediately without sending any SIP signaling to CUCM, improving user experience and reducing unnecessary signaling traffic. D is correct: KPML (Key Press Markup Language) can be used alongside SIP dial rules - when CUCM needs additional digits to complete routing, KPML enables the phone to send individual key presses to CUCM in real time. A is incorrect because the phone still sends SIP signaling to CUCM to initiate a call. C is incorrect because completed digit strings are sent in a SIP INVITE message, not a SIP 200 OK (which is a response, not a request).

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