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VP-102 / VP-202 User Manual
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3.
Jitter Buffer Mode
–Three jitter modes are available. The
Fixed Mode
, which is the default
mode, is a simple first in first out mode, with a fixed jitter buffer delay. By definition the jitter buffer
depth is twice the jitter buffer delay. The
Sequential Mode
is also a fixed jitter buffer delay mode,
but in this mode the jitter buffer function looks at the packet timestamp for dropped or out of
sequence packet problems. The data packets are sorted based on the packet timestamp. The
Adaptive Mode
optimizes the size of the jitter buffer delay and depth in response to network
conditions, in addition to the sequential mode.
4.
Media QoS
– QoS is also available for Media packets to improve voice quality. This is rather
significant in a network environment with large amount of data traffics. Both
IP TOS
and
DiffServ
methods are supported.
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.
