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CCNP Voice TVoice 642-427 Quick Reference by Brion S. Washington

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Section 9. Troubleshooting Call Setup Issues

When troubleshooting calls, the type of deployment model used can help isolate what might be causing the issue. The art of troubleshooting any type of call setup is in knowing where the call is coming from, who is being called, and who has permission to call whom. When these things are known, you can start to determine where to begin.

We begin by looking at the common call setup issues:

• Dead air

• No ring back

• Missing caller ID or no caller ID

• Fast busy tone

• Unexpected second dial tone

Intrasite Call Setup

Single-site deployments are naturally easier to resolve because they have fewer pieces of the puzzle and less-complex dial plans. All devices are considered local to the Unified Communication ...

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