50 Operation
Chapter 3 - Using the Web Configuration Server
Click on the Save SIP Extensions Settings button before leaving the page to save
the new settings. The new settings will be applied after restarting the unit.
3.7.3 NAT Traversal Configuration Page (SIP Only)NAT Traversal function can be used to allow the Voice Gateway to register to a SIP
proxy server even though the Voice Gateway is connected behind a NAT device.
Port forwarding may need to be activated for all telephone ports used by the Voice
Gateway: For example, RTP port range and SIP signaling ports.
The Keep alive timeout parameter in the Telephony page may also need to be set
to a value lower than 1200 seconds to ensure that the Voice Gateway will not lose
registration to the SIP server.
The NAT Traversal Configuration page includes the following components:
Figure 3-16: NAT Traversal Configuration Extensions Page
Table 3-10: NAT Traversal Configuration Page Parameters
Parameter Description
External NAT-mapped
IP Address
The IP address that the NAT device uses on the WAN side. If the Voice
Gateway is set to Auto NAT mode (see below), the IP address of the outside
IP will be automatically inserted. If the NAT Mode is set to On, a NAT IP
Address must be set.