Fw (Firewall) Nat Keep Alive - Polycom RealPresence RMX 1500 Administrator's Manual

Business to Business Connections
Enterprise A Client
Environment Registered
SIP Yes
SIP Yes

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.
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 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.
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.
Polycom®, Inc.
SBC
RealPresence

Access
Director
Acme Packet 
Enterprise B Client
SBC Registered
RealPresence Yes
Access
Director
Acme Packet Yes
Network Security
Environment
H.323
H.323
564