Polycom 1500/1800/2000/4000 Manual De Usuario
Network Security
Polycom®, Inc.
564
FW (Firewall) NAT Keep Alive
The Collaboration Server can be configured to send a FW NAT keep alive message at specific Intervals for
the RTP, UDP and BFCP channels.
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.
directions. The firewall will only allow UDP packets into the network through ports that have been used to
send packets out.
By default the Collaboration Server 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 Collaboration Server sends out the first of the FW NAT
Keep Alive messages 30 seconds after the call starts.
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 Collaboration Server 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.
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.
SIP
Yes
RealPresence
Access
Director
Access
Director
RealPresence
Access
Director
Access
Director
Yes
H.323
SIP
Yes
Acme Packet
Acme Packet
Yes
H.323
Business to Business Connections
Enterprise A Client
Enterprise B Client
Environment
Registered
SBC
SBC
Registered
Environment