Nat Settings; Network Settings - Cisco SPA 501G Administration Manual

Cisco SPA 500 Series and Wireless IP Phone Field Reference
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Cisco SPA 500 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

Network Settings

Parameter
SIP TOS/DiffServ Value
SIP CoS Value
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.
Description
TOS/DiffServ field value in UDP IP packets carrying a
SIP message.
Defaults to 0x68.
CoS value for SIP messages.
Defaults to 3.
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