This book extract from 'Implementing Cisco Unified Communications' explores issues involved in multisite deployments of Unified Communications Manager, including:
1. Multisite deployment challenge overview
2. Quality challenges
3. Bandwidth challenges
4. Availability challenges
5. Dial plan challenges
6. Overlapping and nonconsecutive numbers
7. Fixed versus variable-length numbering plans
8. Variable-length numbering, E.164 addressing and DID
9. Optimized call routing and PSTN backup
10. NAT and security issues
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