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SBC or ALG proxy/registrar The phone at IP address 10.10.10.20 is configured to register with the proxy at 63.251.195.20. Because the proxy/registrar has session border control (SBC) or application layer gateway (ALG) functionality, no additional IP phone configuration is required. Other proxy/registrars The phone at IP address 10.10.10.30 is configured to register with the proxy at 63.251.195.30. Because this proxy/registrar is not a Nortel proxy and has no SBC or ALG functionality, the configuration must additionally include the "sip nat ip" and "sip nat port" settings that contain the public ip address of the NAT router and the port used for call signaling messages. This information is embedded in protocol messages to allow the proxy/registrar to reach the IP phone on the NAT router private network. NAT router configuration You must configure the NAT router to allow signaling or media packets containing the various UDP port values to flow between the private and public networks that are separated by the NAT router. In the sample network, the NAT router must not filter packets using ports 3000, 5060, 6060, 16420, and 16430. Configuring 41-001160-00, Rev 01 Release 2.0 4-19 IP Phone Administrator Guide Advanced Network Settings Nortel Networks NAT Configuring the IP Phones Configuring Nortel NAT (optional) 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. 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. 2 Select Network Settings. 3 Select NAT. 4 Select Nortel. 5 Select 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. 4-20 41-001160-00, Rev 01 Release 2.0 Network Configuration of the IP Phones Advanced Network Settings . Aastra Web UI Step Action 1 Click on Advanced Settings->Network->Advanced Network Settings. 2 Select Yes (enable) or No (disable) in the "Nortel NAT Traversal Enabled" field to enable or disable NAT for a Nortel network. 3 Enter a time, in seconds, in the "Nortel NAT timer" field. Valid values are 0 to 2147483647. Default is 60. 4 Click to save your settings. Note: The session prompts you to restart the IP phone to apply the configuration settings. 5 Select Operation->Reset and click .. Configuring 41-001160-00, Rev 01 Release 2.0 4-21 IP Phone Administrator Guide Advanced Network Settings Configuring the IP Phones Configuring NAT Address and Port (optional) You can also configure a specific NAT address and port on the IP phone using the configuration files, IP Phone UI, or 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. 2 Select Network Settings. 3 Select NAT. 4 Select NAT Settings. 5 Select NAT IP. 6 Enter a public IP address of your NAT device in dotted-decimal format. 7 Press Done to save the NAT setting. 8 Select NAT SIP Port. 9 Enter the public SIP signalling port number of your NAT device. 10 Press Done to save the changes. 4-22 41-001160-00, Rev 01 Release 2.0 Network Configuration of the IP Phones Advanced Network Settings . Aastra Web UI Step Action 1 Click on Advanced Settings->Network->Advanced Network Settings. 4 2 Enter a NAT IP address in the "NAT IP" field. 3 Enter a NAT port in the "NAT SIP Port" field. Click to save your settings. Note: The session prompts you to restart the IP phone to apply the configuration settings. 5 Select Operation->Reset and click .. Configuring 41-001160-00, Rev 01 Release 2.0 4-23 IP Phone Administrator Guide Advanced Network Settings HTTPS Client/Server Configuration Configuring the IP Phones HTTPS is a Web protocol that encrypts and decrypts user page requests as well as the pages that are returned by the Web server. HTTPS uses Secure Socket Layer (SSL) or Transport Layer Security (TLS) as a sublayer under its regular HTTP application layering. SSL is a commonly-used protocol for managing the security of a message transmission on the Internet. It uses a 40-bit key size for the RC4 stream encryption algorithm, which is considered an adequate degree of encryption for commercial exchange. TLS is a protocol that ensures privacy between communicating applications and their users on the Inte...

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