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VP-102 / VP-202 User Manual
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5.
Encryption
– For secure voice transmission, RC4 and ET263 Encryptions are supported. Please make sure
your service provider can support this encryption method before enabling this feature.
6.
Symmetric RTP
– Enable the media channel to use symmetric RTP ports. Some network environment
demand the use of Symmetric RTP.
7.
Media NAT Traversal
– NAT Traversal can be set independently for Media packets. This gives a more
flexible setting for various network environment. Three modes are supported:
STUN(RFC 3489)
,
Port-
forward/DMZ
, and
Relay Proxy
.
Relay Proxy
mode is a proprietary NAT protocol and it requires the use of our Relay Proxy Server. All
VoIP signaling packets are encapsulated (encrypted as well if enabled) and transmitted via another
port/channel. Three relay modes of operation are supported.
Mode 1: Use UDP packets and encryption.
Mode 2: Use UDP packets and encryption; use single UDP port.
Mode 3: Use TCP packets and encryption; Use single TCP port;
The mode 2 and mode 3 are the passive and the port use is assigned by the RELAY SERVER.
Note
: For Service providers, RELAY Proxy software is available at no charge. Please contact your
supplier for support. For end user, please contact your service provider to see if this feature is available.
8.
Audio Codec Preference
– The table below list the voice codec priorities in descending order. Each voice
codec can be enabled (place a check mark in the check box) or disabled individually. Select the voice code
and then click on the UP or DOWN button to move the order on the list.
