Polycom 1500/1800/2000/4000 FW Firewall NAT Keep Alive, To enable and modify FW NAT Keep Alive

Network Security

Business to Business Connections

Enterprise A Client

Environment Registered SBC

Enterprise B Client

SBC Registered Environment

SIP	Yes	RealPresence
		Access
		Director
SIP	Yes	Acme Packet

	RealPresence	Yes	H.323
	Access
	Director
	Acme Packet	Yes	H.323

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.

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