Polycom MGC-50, MGC-100 manual Field Description When fixed ports, Are exhausted, NAT Traversal

MGC-50/MGC-100 Getting Started Guide

Table 3-17: Fixed Ports & NAT Options (Continued)

Field	Description
When fixed ports	Selecting one of the following options defines the
are exhausted	card behavior when all allocated ports in the firewall
	are exhausted when the initial number of predicted
	calls is exceeded.
	• Allocation ports dynamically - to allocate any
	of the available ports in the firewall to calls that
	exceed the number of predicted simultaneous
	calls. These ports may not be secured.
	• Reject - to reject any request to open additional
	ports and the call will be rejected.
NAT Traversal
Use Span External	Define the method in which the public IP address is
Address	mapped to the IP card’s internal address:
	Off – No external IP address will be used. Select this
	option for local calls.
	Specify – Select this option to manually define the
	IP card’s public IP address.
	Auto – The IP card’s public IP address is
	automatically retrieved from the HTML Answer of the
	external server.
	http://videovideo.polycom.austin.com.
	The automatically retrieved IP address appears in
	the IP Card Settings-IP-Network Parameters tab.
External IP	If you selected Specify, enter the IP card’s public IP
address	address.

Notes: For a complete port configuration you define both the fixed ports (signaling, media, etc.) and the relevant reserved ports. Make sure that the following IANA registered ports have been opened as part of your firewall’s definitions:

•Port # 1720 – H.323 standard signaling port

•Port # 1719 – H.323 gatekeeper port

•Port # 1503 – T.120 port for incoming connections

•Port # 5060 –SIP standard signaling port

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