Polycom 4300T - Manual (Page 44)

User Guide V 2 IU 4300T Converged Network Appliance
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Change the Administration Password
We strongly recommend that you change the default password for the root
administrative account using the following steps:
1. Enter the password you chose in step C again in the Confirm Password to
ensure that there were no mistakes in the initial entry.
2. Press Submit.
VoIP Configuration
The 4300T provides a VoIP application layer gateway (ALG) for the SIP,
MGCP, and H.323 protocols. The ALG proxies the connection between the
VoIP softswitch, IP PBX or gatekeeper and voice and video devices such as IP
phones, IADs or softphones. By acting as a proxy the 4300T is able to provide
several important functions for IP based voice and video:
• Provide NAT/PAT services for voice and video traffic. NAT/PAT for
VoIP enables you to use a single public IP address on the WAN interface
of the 4300T to represent multiple private IP addresses assigned to voice
or video devices on the LAN. The NAT function maps both IP address
and IP port number between the public and private addresses so that all
signaling and VoIP media packets are translated. A single public IP
address can support up to 253 voice and video devices.
• Provide security services for voice and video traffic.
— NAT/PAT services hide enterprise LAN topology from hackers.
— The ALG acts as a “voice and video aware” firewall and ensures only
authenticated voice traffic enters the enterprise LAN. This is
accomplished by the dynamic provisioning of signaling and media
ports for authenticated voice devices. The implementation is stateful
and open ports are closed automatically when no longer required to
support the voice or video call.
Note The new password must be between 6 and 20 characters in length. Any
combination of alpha and numeric characters is accepted.