Cisco 521SG Administration Guide - Page 247
EXT RTP Port Min, NAT Keep Alive Intvl
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Cisco SPA IP Phone Field Reference SIP Tab A Parameter EXT IP EXT RTP Port Min NAT Keep Alive Intvl Description External IP address to substitute for the actual IP address of the SPA9000 in all outgoing SIP messages. If 0.0.0.0 is specified, no IP address substitution is performed. If this parameter is specified, the SPA9000 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. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 246