Revolabs FLX2 VoIP Advanced - Manual (Page 68)

68
remote nodes), FLX sends STUN binding requests as part of the
media connectivity tests. When a candidate is nominated for use,
a STUN binding request is sent with a flag indicating that the
candidate pair is nominated. There are two nomination methods
that can be used:
Regular
– For Regular Nomination, FLX validates candidate pairs
with initial STUN binding requests, and then selects a valid
candidate pair by sending another STUN binding request with a
flag indicating that the pair is nominated.
Aggressive
– For Aggressive Nomination, FLX doesn’t wait to set
the nominated flag in a second STUN binding request, but rather
sets the flag in the STUN binding requests for all of the candidate
pairs. The ICE processing completes when the first pair
successfully passes connectivity checks. The aggressive method
is faster but does not always result in the optimal path being
selected. This is the default method.
Maximum
number of ICE
host candidates An ICE host candidate is an actual local transport address in the
host. Host transport addresses are obtained by binding to
attached network interfaces. These interfaces include both
physical interfaces and virtual interfaces such as VPN. This option
specifies the maximum number of local ICE host candidates that
may be used in evaluating candidate pairs when determining the
best route. The default value is -1 or an empty field, which
indicates that there is no maximum.
Disable RTCP
component in
ICE Select this option to disable the RTCP component in ICE. The
option is unchecked by default.
Enable TURN
relay with ICE Select this option to enable the use of a TURN (Traversal Using
Relay NAT) relay when using ICE. A TURN relay is a media relay
server residing on the public internet which can relay media data
packet between clients. TURN relays are used when other
preferred mechanisms are not available, such as STUN or direct
connectivity. The option is unchecked by default. If TURN is
enabled, the TURN settings below (server, username and
password) must also be specified.
TURN Server Specify the TURN server domain name or hostname. The format
is either "DOMAIN:PORT" or "HOST:PORT"
TURN Username Specify the username to authenticate against the TURN server.
TURN Password Specify the password to authenticate against the TURN server.
Use TCP
connection to
TURN server
Use TCP to communicate with the TURN server rather than UDP.
This option is unchecked by default.
QoS
Enable QoS
Select this option to enable QoS (Quality of Service) tagging for
SIP and media. For layer 3, at the Internet layer, the DiffServ
(Differentiated Services) precedence level is Class 3. The