Polycom MGC-100 Getting Started Manual page 86

MGC-50/MGC-100 Getting Started Guide
3-56
Table 3-17: Fixed Ports & NAT Dialog Box Options (Continued)
Field
NAT Traversal
Use Span External
Address
External IP
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 reserved for system services 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
Entering a well-known port that the IANA has reserved for other applications in
your configuration is not allowed as it would result in system service failure. It is
highly recommended to use ports from the dynamic range defined by IANA.
18. Click OK to return to the Span dialog box.
The new span is added to the Spans table.
Description
Define the method in which the public IP address is
mapped to the IP card's internal address:
Off – No external IP address will be used. Select this
option for local calls, there is no need to use the
public IP address to identify the source and
destination for the messaging.
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.
If you selected Specify, enter the IP card's public IP
address.