Linksys SPA922 Cisco Small Business IP Phone SPA9X1 Administration Guide - Page 122
Linksys Key System Parameters, NAT Keep Alive Intvl
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Chapter 5 Linksys IP Phone Field Reference SIP Tab Field STUN Enable STUN Test Enable STUN Server EXT IP EXT RTP Port Min NAT Keep Alive Intvl Description Enables the use of STUN to discover NAT mapping. Select yes or no from the drop-down menu. Defaults to no. If the STUN Enable feature is enabled and a valid STUN server is available, the Linksys IP phone can perform a NAT-type discovery operation when it powers on. It contacts the configured STUN server, and the result of the discovery is reported in a Warning header in all subsequent REGISTER requests. If the Linksys IP phone detects symmetric NAT or a symmetric firewall, NAT mapping is disabled. Defaults to no. IP address or fully-qualified domain name of the STUN server to contact for NAT mapping discovery. External IP address to substitute for the actual IP address of the Linksys IP phone in all outgoing SIP messages. If 0.0.0.0 is specified, no IP address substitution is performed. If this parameter is specified, the Linksys IP phone assumes this IP address when generating SIP messages and SDP (if NAT Mapping is enabled for that line). However, the results of STUN and VIA received parameter processing, if available, supersede this statically configured value. Defaults to blank. External port mapping number of the RTP Port Min. number. If this value is not zero, the RTP port number in all outgoing SIP messages is substituted for the corresponding port value in the external RTP port range. Defaults to blank. Interval between NAT-mapping keep alive messages. Defaults to 15. Linksys Key System Parameters Field Linksys Key System Multicast Address Force LAN Codec Description Enable or disable the Linksys Key System on the IP phone. Defaults to yes. The multicast address is used by the SPA9000 to communicate with the Linksys IP IP phones. Defaults to 224.168.168.168:6061. The choices are: none, G.711u, or G.711a. Defaults to none. Firmware Version 5.1 Linksys IP Phone Administrator Guide 5-17