Nat Settings - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Cisco SPA IP Phone Field Reference
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Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide

NAT Settings

Parameter
NAT Mapping Enable
NAT Keep Alive Enable
NAT Keep Alive Msg
NAT Keep Alive Dest
Description
To use externally mapped IP addresses and SIP/
RTP ports in SIP messages, select yes.
Otherwise, select no.
Defaults to no.
To send the configured NAT keep alive message
periodically, select yes. Otherwise, select no.
Defaults to no.
Enter the keep alive message that should be sent
periodically to maintain the current NAT mapping.
If the value is $NOTIFY, a NOTIFY message is sent.
If the value is $REGISTER, a REGISTER message
without contact is sent.
Defaults to $NOTIFY.
Destination that should receive NAT keep alive
messages. If the value is $PROXY, the messages
are sent to the current or outbound proxy.
Defaults to $PROXY.
A
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