Configuring Advanced Features
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To configure DSCPs for voice packets and SIP packets via web user interface:
1. Click on Network->Advanced.
2. Enter the desired value in the Voice QoS (0~63) field.
3. Enter the desired value in the SIP QoS (0~63) field.
4. Click Confirm to accept the change.
A dialog box pops up to prompt that settings will take effect after a reboot.
5. Click OK to reboot the phone.
Network Address Translation (NAT) is essentially a translation table that maps public IP
address and port combinations to private ones. This reduces the need for a large
number of public IP addresses. NAT ensures security since each outgoing or incoming
request must first go through a translation process. But in the VoIP environment, NAT
breaks end-to-end connectivity.
NAT Traversal
NAT traversal is a general term for techniques that establish and maintain IP
connections traversing NAT gateways, typically required for client-to-client networking
applications, especially for VoIP deployments. STUN is one of the NAT traversal
techniques supported by IP phones.
STUN (Simple Traversal of UDP over NATs)
STUN is a network protocol, used in NAT traversal for applications of real-time voice,
video, messaging, and other interactive IP communications. The STUN protocol allows
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