Linksys SPA921 Cisco SPA9000 Voice System Administration Guide - Page 214

SPA9000 Field Reference Voice tab B EXT RTP Port Min NAT Keep Alive Intvl 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. Default: blank Interval between NAT-mapping keep alive messages. Default: 15 Voice tab > SIP page PBX Parameters section Field Proxy Network Interface Description This setting tells the SPA9000 how the client stations are connected. Choices: {LAN, WAN}. The SPA9000 communicates with client stations via the selected interface only. Default: WAN Proxy Listen Port NOTE For optimum voice performance, Linksys Engineering and Quality Assurance recommend that only WAN is used. Port at which the SPA9000 listens for client messages at the selected network interface. The proxy also sends SIP messages from this port. Multicast Address Default: 6060 IP address (and port number) where the SPA9000 sends control messages to all the client stations at once. This must be a multicast address and must contain a port number. Group Page Address Default: 224.168.168.168:6061 IP address (and port number) where the SPA9000 tells the client stations to send and receive group page RTP packets. This must be a multicast address and must contain a port number. Max Expires Default: 224.168.168.168:34567 Sets the maximum allowed Registration expires value in seconds for client stations. Linksys recommends using a relatively small value, such as 60 or 120. Default: 60 SPA9000 Voice System Administration Guide 212