1.3.7 LACNIC
1.3.7.1 Manual de políticas de LACNIC
Before removing old versions of Unified Messaging from the organization, ensure that sup-porting Exchange migration steps have taken place, including migrating all UM-enabled mailboxes to Exchange Server 2013. For example, if the UM server is also an Exchange 2010 transport server, all related transport migration must be performed according to relevant guidance for that role.
After ensuring that calls are not being received by the legacy Exchange 2007 or 2010 server, the following steps must be taken to correctly decommission the legacy system:
1. Using the Exchange Management Console, navigate to Servers, Unified Messaging, and select the UM server to decommission. In the Actions pane, disable all incoming calls to the server.
2. With the incoming calls disabled, the server can now be removed for the existing Uni-fied Messaging dial plan (or multiple dial plans) it was associated with. Use the Ex-change Server 2013 management tools to remove the UM server from the dial plan.
3. Uninstall all Unified Messaging language packs currently installed on the Exchange UM server, before proceeding with the full uninstallation of Microsoft Exchange.
Always ensure that a Unified Messaging server that is no longer in use is properly decom-missioned and uninstalled. As with all Exchange Servers, not only is the server installed onto the Windows Server but it is installed into Active Directory. Following the correct procedure for uninstallation ensures clean removal and is the only supported way to remove the server from the Exchange organization.
Thought experiment
Exchange Server consolidation
In this thought experiment, apply what you’ve learned about this objective. You can find answers to these questions in the “Answers” section at the end of this chapter.
You are planning a migration from Exchange 2007 to Exchange 2013, and as part of the design a centralized Exchange infrastructure will be implemented at your main datacenter, rather than Exchange 2007 servers at every site. The existing environ-ment has a 1-to-1 relationship between IP gateways and UM servers, whereas the new environment will use a single Database Availability Group with eight multi-role servers.
1. What impact could this have on audio quality and how might you mitigate this?
2. What network areas should you investigate if you want to ensure that com-munications between IP-PBX systems and the new Exchange 2013 servers will succeed?
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Objective summary
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■ Exchange 2013 Unified Messaging is always installed with Exchange, so your prepara-tion may include installaprepara-tion of the new UM version.
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■ Use the information available in the legacy Exchange environment to help you plan your new implementation. Use UM mailbox counts and statistics to aid sizing.
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■ Most migrations involve a degree of coexistence, so ensure you co-ordinate upgrades to dependencies carefully.
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■ Move SIP gateway configuration to Exchange 2013 last.
Objective review
Answer the following questions to test your knowledge of the information in this objective.
You can find the answers to these questions and explanations of why each answer choice is correct or incorrect in the “Answers” section at the end of this chapter.
1. The IP gateway is configured to connect to Exchange 2007 using an IP address. When a user is migrated to Exchange 2013, the calls to UM never reach the UM call router service on an Exchange 2013 server. Firewall rules are correct. Which of the following is a possible resolution?
a. Reconfigure the IP gateway to use the IP address of the Exchange 2013 server instead of the Exchange 2007 server.
B. Reconfigure the IP gateway so it can use DNS resolution.
C. Update the settings on the IP gateway to use the DNS name of the Exchange 2007 server.
D. Verify that the SSL certificates are correctly configured on the Exchange 2013 serv-ers.
2. The final mailbox has been migrated to Exchange 2013 and your colleague switches off the final Exchange 2010 UM servers without uninstallation. What issues may an admin-istrator see if the servers are not uninstalled correctly? (Choose all that apply.)
a. No issues, this is the correct way to decommission the server.
B. The UM servers may still appear in Exchange management tools and cause time-outs.
C. A future upgrade to a newer Exchange version may not be possible without reme-diation.
D. SSL certificate generation will fail.
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Answers
This section contains the solutions to the thought experiments and answers to the objective review questions in this chapter.
Objective 1.1: Thought experiment
1. Use the auto attendant feature to provide a menu to inbound callers.
2. Call answering rules can be used to provide a menu on an individual user’s voice mail.
The helpdesk role can allow an administrator to configure this or this action can be performed using PowerShell.
Objective 1.1: Review
1. Correct answer: B
a. Incorrect: The underlying IP address must be correct, however the MTLS session will not be able to begin using an IP address.
B. Correct: MTLS will use a FQDN of a server or device with a matching SSL certificate.
C. Incorrect: While a firewall may cause problems with establishing communications, the FQDN of the server should be specified first before further troubleshooting.
D. Incorrect: The port chosen, 5061 is suitable for MTLS communications. 5060 is used for unsecured communications.
2. Correct answer: A
a. Correct: SIP dial plans must be associated with Exchange 2013 Servers.
B. Incorrect: E.164 dial plans cannot be associated with an Exchange 2013 Server.
C. Incorrect: Extension dial plans cannot be associated with an Exchange 2013 Server.
D. Incorrect: Only SIP dial plans can be associated with Exchange 2013 Servers.
3. Correct answer: D
a. Incorrect: The SIP protocol does not initiate audio, and the UM Call Router will redirect the traffic rather than initiate an audio call.
B. Incorrect: Although some traffic is proxied by a Client Access server, UM traffic is redirected.
C. Incorrect: While in the scenario where the UM call router answering the call is the same server as the one hosting the active copy of the mailbox being called, this is not always going to be true in larger organizations.
D. Correct: The UM call router will lookup the location of the active copy of the user mailbox and redirect the SIP call to the Mailbox server.
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Objective 1.2: Thought experiment
1. Install the Polish language pack on all Exchange Servers in both Database Availability Groups and allow users to select their preferred language
2. Install the Polish language pack on the DAG nodes that will host mailboxes for the Pol-ish users. Create a new UM dial plan and set the default language to PolPol-ish, and assign the UM dial plan to the same DAG nodes and the Polish user mailboxes.
Objective 1.2: Review
1. Correct answer: C
a. Incorrect: The Voice Preview setting is configured via the UM mailbox policy, not a UM dial plan. Additionally, to switch UM dial plans, the user must have UM disabled and re-enabled.
B. Incorrect: The Voice Preview setting is indeed configured via a UM mailbox policy but a new UM dial plan is not required.
C. Correct: A new UM mailbox policy can be added to the existing UM dial plan with Voice Preview disabled, and users can simply be switched to use the new UM mailbox policy.
D. Incorrect: The Voice Preview setting is configured via the UM mailbox policy, not a UM dial plan.
2. Correct answer: A
a. Correct: A secondary dial plan allows the user to receive voice mail from two separate IP-PBX systems.
B. Incorrect: Although this technique may work, it may involve additional expense to route calls externally between systems or introduce complex troubleshooting.
C. Incorrect: The user will only be able to receive voice mail for one number at a time using this approach, and it increases the user and IT team workload.
D. Incorrect: Adding the extension alone will not allow the user to receive voice mail.
They must also have a matching dial plan.
Objective 1.3: Thought experiment
1. You can use the Exchange Management Shell to generate reports. Any task that can be performed via the Exchange Admin Shell can be contained within a script and then automated as a scheduled task.
2. The UM Management role group will provide access to the UM features within Ex-change Server without providing the phone team full access to ExEx-change.
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Objective 1.3: Review
1. Correct answers: B and D
a. Incorrect: A self-signed SSL certificate cannot be used for MTLS with Lync/Skype for business.
B. Correct: An Enterprise CA trusted by both systems with the FQDN of the server is valid.
C. Incorrect: The UM services will use a FQDN rather than the defined HTTPS URLs and the communication will fail.
D. Correct: A third-party CA trusted by both systems including the FQDN of the server is valid.
2. Correct answer: A
a. Correct: This port is used for unsecured SIP communications by the UM call router service.
B. Incorrect: This port is used for SIP secured communications by the UM call router service.
C. Incorrect: This port is used for SIP secured communications by the UM service.
D. Incorrect: This port is used for SIP secured communications by the UM worker process.
Objective 1.4: Thought experiment
1. Audio quality may suffer when the WAN links between sites are congested. Consider implementing Quality of Service before your migration begins.
2. IP-PBX systems will now need to communicate over WAN links to the central datacen-ter. Ensure that routing rules and firewall rules allow traffic to flow both ways, and the correct ports are open.
Objective 1.4: Review
1. Correct answer: B
a. Incorrect: This may allow the UM call to succeed for the user migrated, but is likely to break UM for Exchange 2007 users.
B. Correct: The redirect from the Exchange 2007 server will refer the IP gateway to a FQDN and port number of an Exchange 2013 UM call router.
C. Incorrect: As the issue appeared to be the DNS-based redirection, this change may break communications with the Exchange 2007 UM server as well.
D. Incorrect: As the IP gateway is using an IP address to communicate with the Ex-change 2007 server, MTLS is not configured and working.
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a. Incorrect: The issues described in B and C are one of numerous issues that may oc-cur.
B. Correct: The list of Exchange servers returned by management tools will include the switched off UM servers and the tools may attempt to contact and interrogate the servers, causing timeouts and error messages.
C. Correct: Just like Exchange 2013 cannot be installed into an organization that still has Exchange 2003 servers, the UM servers that have not been uninstalled properly will still appear to exist within the organization. This may prevent a future upgrade.
D. Incorrect: SSL certificate generation does not depend on the availability of exist-ing servers.
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