SATSPEEDBOX III R7920 Manual
Page 33
Codec Setting
Codec
A CODEC is an algorithm for taking voice or video and compressing the information.
This type of codec combines analog-to-digital conversion and digital-to-analog
conversion functions in a single chip. The Codec is used to compress the voice signal
into data packets. Each Codec has different bandwidth requirement. There are 9
kinds of codec, G.711/Ulaw, G.711/Alaw, G.729 (default and standard for satcall
through satellite connection), G.723 (5.3k / 6.3k bps), G.726(16K bps), G.726(24K
bps), G.726(32K bps), G.726(40K bps)
NAT Traversal
STUN {Simple Traversal of UDP through NATs (Network Address Translation)} is a
protocol for assisting devices behind a NAT firewall or router with their packet
routing.
STUN enables a device to find out its public IP address and the type of NAT service
its sitting behind.
When you enable the STUN function, you must input the STUN server address.
Set User Header To Phone
To have the device add a “user=phone” parameter to the SIP URI before sending a
SIP INVITE request, select the enable option next Set User Header to Phone. This
parameter indicates the user part of the SIP URI (<user>@<sipserver>) the device
is calling is a valid telephone number.
