Free Implementing Cisco Advanced Call Control On-Premises Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Implementing Cisco Advanced Call Control On-Premises practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A Cisco IOS XE gateway receives 180 Ringing with SDP, but provides local ringback rather than cutting through early media. The configuration includes disable-early-media 180. Which diagnosis explains this behavior?

   1. A. The command ignores SDP in 180 responses for early media.
   2. B. The command requires SDP in a PRACK before local ringback.
   3. C. The command treats every 180 response as a final answer.
   4. D. The command disables SDP processing in 183 responses only.

   Answer: A

   Explanation: Cisco states, "Disables the gateway’s ability to process SDP in a 180 response as a request for early media cut-through." The configured command explains local ringback despite SDP in the 180 response; it does not convert provisional responses into final answers or act only on 183.

   Reference: Cisco Unified Border Element Configuration Guide — SIP Enhanced 180 Provisional Response Handling — Configuring SIP Enhanced 180 Provisional Response Handling, step 5

2. 2An administrator is provisioning SIP phones for standalone call control on a standard Cisco Unified CME deployment. Which command enables CME provisioning under voice register global?

   1. A. default mode
   2. B. mode cme
   3. C. registrar server
   4. D. allow-connections sip to sip

   Answer: B

   Explanation: Cisco describes mode cme as "Enables mode for provisioning SIP phones in Cisco Unified CME." The default SRST mode, SIP registrar enablement, and SIP-to-SIP call permission do not select standalone CME provisioning.

   Reference: Cisco Unified CME System Administrator Guide — System-Level Parameters — Set Up Cisco Unified CME for SIP Phones, step 4

3. 3A Unified CM 12.x SIP trunk must always send an early offer, while allocating an MTP for offer creation only when the calling device cannot supply the required media information. Which configuration meets both requirements?

   1. A. Select Best Effort (no MTP inserted) in the SIP profile.
   2. B. Select Mandatory (insert MTP if needed) in the SIP profile.
   3. C. Select Media Termination Point Required on every call's trunk.
   4. D. Leave early-offer support disabled in the SIP profile.

   Answer: B

   Explanation: Cisco states that Mandatory early offer "inserts an MTP only if the calling device cannot provide Unified CM with the media characteristics required to create the Early Offer." Best Effort may send delayed offer; forcing MTP Required allocates it beyond the stated need.

   Reference: Cisco Collaboration System 12.x SRND — Cisco Unified CM Trunks — Page 6-19, Early Offer Using Mandatory Support

4. 4Which UCM function issues Locally Significant Certificates to supported Cisco IP phones and supports their certificate lifecycle?

   1. A. Certificate Authority Proxy Function (CAPF)
   2. B. Trust Verification Service (TVS)
   3. C. Cisco TFTP service
   4. D. Cisco CTL Provider service

   Answer: A

   Explanation: Cisco states, "The Certificate Authority Proxy Function (CAPF) issues Locally Significant Certificates (LSCs) and authenticates endpoints." Certificate issuance belongs to CAPF; trust verification, configuration-file distribution and CTL management are different parts of the secure-phone lifecycle.

   Reference: Cisco UCM Security Guide — Certificate Authority Proxy Function — Certificates Authority Proxy Function Overview

5. 5Which public DNS SRV record should be configured so external MRA clients can discover Expressway-E for the domain example.com?

   1. A. _cisco-uds._tcp.example.com
   2. B. _sip._udp.example.com
   3. C. _collab-edge._tls.example.com
   4. D. _sips._tcp.example.com

   Answer: C

   Explanation: Cisco states, "The public, external DNS must be configured with _collab-edge._tls.<domain> SRV records so that endpoints can discover the Expressway-Es to use for Mobile and Remote Access." The UDS and SIP service records serve different discovery purposes.

   Reference: Mobile and Remote Access Through Cisco Expressway — Requirements and Prerequisites — Public DNS (External Domains)

6. 6A reliable 183 response contains RSeq: 702 and CSeq: 41 INVITE. A PRACK in the same dialog receives 481 because its RAck does not match the outstanding response. Which RAck value fixes the mismatch?

   1. A. 41 702 INVITE
   2. B. 702 41 PRACK
   3. C. 702 41 INVITE
   4. D. 702 42 INVITE

   Answer: C

   Explanation: RFC 3262 states, "The first number is the value from the RSeq header in the provisional response that is being acknowledged." It continues, "The next number, and the method, are copied from the CSeq in the response that is being acknowledged." Therefore RAck must be 702 41 INVITE, not reversed, incremented, or labeled PRACK.

   Reference: RFC 3262 — Reliability of Provisional Responses in SIP — Section 7.2, RAck

7. 7SIP phones must send their CME registration messages to 10.20.30.1 on port 5060. Which command under voice register global establishes that address and port on the CME router?

   1. A. proxy 10.20.30.1 preference 1
   2. B. session target ipv4:10.20.30.1
   3. C. source-address 10.20.30.1 port 5060
   4. D. ip source-address 10.20.30.1 port 2000

   Answer: C

   Explanation: Cisco states that source-address "Enables the Cisco Unified CME router to receive messages from SIP phones through the specified IP address and port." The requested SIP registration listener belongs under voice register global; a dial-peer target or pool proxy does not configure it.

   Reference: Cisco Unified CME System Administrator Guide — System-Level Parameters — Set Up Cisco Unified CME for SIP Phones, step 5

8. 8A validated Lua normalization script must modify SIP messages on one specific UCM trunk. Where should the administrator apply that script directly?

   1. A. Import the script into UCM but leave the trunk's script field unassigned.
   2. B. Assign the script only to the SIP Profile used by a registered SIP phone.
   3. C. Enable script tracing without selecting a script on the target trunk.
   4. D. Select the script in the target trunk's Normalization Script field.

   Answer: D

   Explanation: Cisco instructs, "From the Normalization Script drop-down list, choose the script that you want to apply to the trunk." Import makes a script available but does not attach it; phone-profile application scopes it to that device, and tracing does not replace selecting the trunk script.

   Reference: Cisco UCM Feature Configuration Guide — SIP Normalization and Transparency — Apply Normalization or Transparency Script to SIP Trunk, step 3

9. 9Which UCM trust store is identified for trusting a SIP user agent certificate used to authenticate a connection over a SIP trunk?

   1. A. Tomcat web-application trust store
   2. B. IPSec-trust store
   3. C. CallManager trust store
   4. D. Userlicensing-trust store

   Answer: C

   Explanation: Cisco states, "A SIP user agent that connects via a SIP trunk authenticates to Unified Communications Manager if the CallManager trust store contains the SIP user agent certificate". The peer also needs the UCM certificate in its own trust store; web, IPsec, and licensing stores serve other purposes.

   Reference: Cisco UCM Security Guide — Certificates — Certificate Types, SIP Proxy server certificate

10. 10Expressway-C and Expressway-E use the same internal address space, and both undergo static address translation. Which proposed address plan satisfies Cisco's MRA addressing requirements? Each pair lists C first, then E.

    1. A. Internal: 10.1.1.10 / 10.1.1.20; translated: 203.0.113.10 / 203.0.113.10.
    2. B. Internal: 10.1.1.10 / 10.1.1.20; translated: 203.0.113.10 / 203.0.113.20.
    3. C. Internal: 10.1.1.10 / 10.1.1.10; translated: 203.0.113.10 / 203.0.113.20.
    4. D. Internal: 10.1.1.10 / 10.1.1.10; translated: 203.0.113.10 / 203.0.113.10.

    Answer: B

    Explanation: Cisco instructs, "Assign separate IP addresses to the Expressway-C and the Expressway-E." It also states, "We do not support shared NAT addresses between Expressway-E and Expressway-C." Only the plan with distinct internal addresses and distinct translated addresses satisfies both requirements. Sharing only the translated address, only the internal address, or both violates at least one requirement.

    Reference: Mobile and Remote Access Through Cisco Expressway — Requirements and Prerequisites — Network Infrastructure Requirements — IP Addresses; Firewall Configuration