•
DHCP server and FTP/TFTP relay. These features are used to simplify and
expedite the IP configuration of phones and PC’s. This also includes VoIP
signaling gateway information (MGCP).
•
Passive call quality monitoring and test tools.
•
VoIP survivability is an orderable software option that provides local call
switching for SIP clients during a WAN link failure or lost of connectivity to a
centralized softswitch or IP PBX. This functionality also includes the ability to
make inbound and outbound calls to a local ethernet connected PSTN gateway
(SIP).
4300T configuration:
•
Firewall enabled
•
VoIP ALG enabled
•
NAT enabled
•
Routing enabled
•
Traffic shaping enabled
•
DHCP server enabled
•
VoIP survivability
Benefits
•
Security of private IP addresses and voice aware firewall
•
Traffic shaping prioritizing voice over data traffic.
•
Recover bandwidth for data when not used for voice
•
Simplified management and administration
•
Simplified adds, moves and changes
•
Scalability – the single public IP address can continue to be used for new
subscribers to the service.
•
Increased availability of voice services through VoIP survivability.
Installing The 4300T With Existing Infrastructure
In enterprise networks with existing routers and firewalls, the 4300T can be
configured as a VoIP application layer gateway only, which maintains the functions
and services of the existing network appliances. It allows all of the existing network
devices to continue to handle data traffic, while the 4300T handles voice and video
traffic as well as provide VoIP survivability.
In the deployment below, the 4300T is connected to a WAN router or broadband
modem using its ethernet WAN port. The enterprise ethernet network is then
connected to a LAN port on the 4300T. In this example a single public IP address is
used to proxy for all of the IP phones and the 4300T routes data traffic to the public
side of the firewall.
Firewall
WAN Termination
(eg. xDSL Modem)
E-300
4300T
L2 Switch
