Best Practices

The following are best practices from this chapter:

• Create a dial plan in advance. Identify all required normalization rules and user dialing habits.

• Plan the voice policies, PSTN usages, and routes to match the different levels of service required for each user.

• Use existing data to analyze PSTN usage in order to estimate IP/PSTN port requirements.

• Assign a backup registrar to pools where voice resiliency is required.

• Deploy Survivable Branch Servers or Survivable Branch Appliances in branch offices without resilient WAN links.

• Complete the network configuration before attempting to enable Call Admission Control, Media Bypass, or Enhanced 911.

• Apply appropriate bandwidth policy limits to sites where WAN bandwidth ...

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