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Advanced Network Settings
4-20 41-001160-00, Rev 01 Release 2.0
IP Phone Administrator Guide
Configuring the IP Phones
Nortel Networks NAT
Nortel Networks provides a proprietary solution to support connectivity to their
proxies from phones placed behind devices (such as routers or firewalls) that use
NAT. Nortel uses the SIP ping request/reply between the Nortel proxy and the
phone in order to keep the connection through the router or firewall active. A SIP
Nortel NAT timer is the interval, in seconds (default is 60), that the phone sends
SIP ping requests to the Nortel proxy.
Configuring Nortel NAT (optional)
You can configure Nortel NAT using the configuration files, the IP phone UI, or
the Aastra Web UI.
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “Network
Address Translation (NAT) Settings” on page A-18.
IP Phone UI
Step Action
1 Press on the phone to enter the Options List.
2Select Network Settings.
3Select NAT.
4Select Nortel.
5Select NAT Enabled.
6 Press Change to set Yes (enable) or No (disable) for NAT on a Nortel network.
7 Press Done to save the changes.