Stephen Technologies Co.,Limited SVG400S IP ADAPTOR User Manual
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D Media Qos
RTP TOS is a service field in UDP IP packets carrying a RTP data. Enter RTP TOS if your
network supports DiffServ and can prioritize the packets to maintain voice quality.
4.4.4 Codec Preference
The Codec Preference is inside the media setting menu. Click on “Codec Preference” in
the “Call Settings Media Setting” configuration page, the “Codec Preference” screen
will be displayed as below.
Codec preference is the order of voice codec. The default one is up transmitting, which is
the set mode for common users.
4.4.5 NAT Traversal
4.4.5.1 Signaling NAT Traversal
Click on the “Signaling NAT Traversal” in the “Call Settings” configuration page’s “Advance
Settings”, the “NAT Traversal” screen will be displayed as follows.
Signaling NAT Traversal can make and receive calls through any type of NAT device.
There are three kinds of NAT traversal:
A None
None means there is no traversal mechanism supported.
B Port-forwarding Support
Port-forwarding is the action of forwarding network ports on the LAN interface to PCs or
servers in LAN network. Virtual servers use this technique to allow external users, in most