Introduction
—Diffserv marking and policing
—Traffic shaping
—VoIP call admission control prevents oversubscription of priority queue
•Security
—Stateful packet inspection firewall
—VoIP aware firewall dynamically provisions and closes UDP ports used for VoIP calls
—IPSec: 3DES,
—NAT/PAT server hides enterprise LAN topology
•Passive Call Quality Monitoring
—Per call statistics include mean opinion score (average and minimum), jitter, latency, packet loss and much more
—Alarms for poor MOS scores
—Active call count indicators
Front Panel LEDs
The LEDs display
| LED Label | Activity | Description |
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A | Power | Off | Power switch is off (or no power from the AC outlet) |
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| Green | Power is supplied to the unit |
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B | Status | Off | The unit could not boot up because of self test |
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| failure |
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| Green | Self test passed |
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| Flashing Green | Configuration is being written to permanent storage |
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| or an upgrade is in progress |
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C | T1 | Off | The T1 is in an alarm state and not synchronized |
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| Green | T1 is in sync and no alarms are reported |
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