Polycom 4300T Benutzerhandbuch

User Guide V

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IU 4300T Converged Network Appliance

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Passive call quality monitoring for each SIP or MGCP voice call includes 

statistics needed to enforce SLAs and resolve networking problems that 

negatively affect call quality.

The 4300T is a powerful, flexible platform that can be deployed initially as a 

low-cost WAN access router and then licensed through software for more 

advanced VoIP features and increased call performance.  It is the ideal 

platform for service providers offering DIA, hosted VoIP and managed 

security services or enterprises migrating to converged voice and data 

networks.

• VoIP

— SIP, MGCP(for voice) and H.323 (for video) application layer gateway 

enables a single public IP address to be used for multiple VoIP 

endpoints

— VoIP survivability provides local call switching to PSTN gateways 

during WAN link failures (SIP only)

• QoS

— Class based queuing/prioritization
— 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, SHA-1
— 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