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Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
272
A
Linksys Key System Parameters
EXT RTP Port Min
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.
NAT Keep Alive Intvl
Interval between NAT-mapping keep alive
messages.
Defaults to 15.
Redirect Keep Alive
If enabled, the IP phone redirects the keepalive
message when SIP_301_MOVED_PERMANENTLY
is received as the registration response.
Parameter
Description
Parameter
Description
Linksys Key System
Enable or disable the Linksys Key System on the
IP phone.
Defaults to yes.
Multicast Address
The multicast address is used by the
Cisco SPA9000 to communicate with the
Cisco SPA IP phones.
Defaults to 224.168.168.168:6061.
Key System Auto
Discovery
Enables or disables auto discovery of the call
control server (for example, the Cisco SPA9000).
Disable this feature for teleworkers or other
scenarios where multicast does not work.