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题库的数量为42道，覆盖率在96%以上，在厂商对考题做出变化时，题库都将在第一时间内更新，确保考生能一次通过考试。
以下是642-426认证的部分考题：
1. Which three capabilities cannot be configured if the default dial peer is matched? (Choose three.) Select 3 response(s).
A. disable DID
B. invoke a Tcl application
C. enable dtmf-relay
D. disable VAD
E. set codec to G.711
F. set preference to 1
Answer: BCD
2. Cisco CallManager 5.0 has just been deployed in two locations across a wide-area link. A distributed model with an intercluster trunk has been used. When you call an IP phone at the remote site the phone rings, but as soon as the other person picks up the phone, the call is dropped.
Where should you look to diagnose the problem?
Select the best response.
A. locations
B. system parameters
C. media resource group
D. Cisco Unified CallManager group
E. Cisco Unified CallManager CTI traces
Answer: C
3. Your company has a centralized IP Telephony system and branch offices in eight major cities. The manager of your company help desk recently published local access numbers for external customers to reduce the costs associated with your company's toll-free 800 service. However, when customers call the new local numbers they hear a reorder tone instead of your centralized IVR.
What is the best solution to this issue?
Select the best response.
A. Deploy transcoders at each remote location.
B. Deploy transcoders at the central location.
C. Deploy Cisco Unified IP IVRs at each remote location.
D. Increase the number of ports in the centralized IVR.
Answer: B
4. You have received a trouble ticket stating that an executive with an account at a bank cannot retrieve account information by phone. When the executive calls the bank, the call is answered and the executive is prompted to enter the account code. However, the bank does not seem to recognize the DTMF tones and disconnects the call.
What is a possible solution to this problem?
Select the best response.
A. Configure the voice rtp send-recv command in the gateway.
B. Set the Cisco Unified CallManager service parameter ToSendH225UserInfoMsg to True.
C. Configure the progress_ind setup enable 3 command under the gateway VoIP dial peer.
D. Configure the progress_ind alert enable 8 command under the gateway POTS dial peer.
Answer: A
5. Partition A contains four route patterns. The calling search space assigned to Device B contains only Partition A. When Device B dials 1136, which of the route patterns will be selected?
Select the best response.
A. 1[14]XX
B. 11X!
C. 1[^2-8]XX
D. 1[1-4]XX
Answer: B
6. You have received a trouble ticket that says users are experiencing echo when their calls go out an H.323 gateway. You have tested the gateway and have modified the configuration so that the ERL level is now 6 dB. You also increased the echo-cancel coverage value to 64 ms. How will this impact voice quality after this change?
Select the best response.
A. The increase in echo-cancel coverage will have no effect on voice quality.
B. The ends of sentences will be chopped by the echo canceller.
C. Consonants will be chopped by the echo canceller.
D. The echo canceller will take 2-3 seconds longer to converge at the beginning of the call.
Answer: D
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