Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
16-78
Polycom, Inc.
FW (Firewall) NAT Keep Alive
The RMX can be configured to send a
FW NAT keep alive
message at specific
Intervals
for the
RTP,
UDP
and
BFCP
channels.
This is necessary because port mappings in the firewall are kept open only if there is
network traffic in both directions. The firewall will only allow
UDP
packets into the
network through ports that have been used to send packets out.
By default the RMX sends a
FW NAT Keep Alive
message every
30
seconds. As there is no
traffic on the
Content
and
FECC
channels as a call begins, the firewall will not allow any
incoming packets from the
Content
and
FECC
channels in until the RMX sends out the first
of the
FW NAT Keep Alive
messages 30 seconds after the call starts.
If
Content
or
FECC
are required within the first 30 seconds of a call the
FW NAT Keep Alive
Interval
should be modified to a lower value.
To enable and modify FW NAT Keep Alive:
FW NAT Keep Alive
is enabled in the
New Profile - Advanced
dialog box.
>>
Select the
FW NAT Keep Alive
check box and if required, modify the
Interval
field within
the range of
5 - 86400
seconds.
System Configuration in SBC environments
In an environment that includes
SAM
(a
Polycom SBC
), to ensure that a
RealPresence Mobile
endpoint can send content to a conference the value of the system flag
NUM_OF_INITIATE_HELLO_MESSAGE_IN_CALL_ESTABLISHMENT
must be set to
at least 3.
For more details on modifying the values of system flags, see "
Manually Adding and Deleting
System Flags”
on page
21-12
.
Содержание RealPresence 2000
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