Cisco SPA112 Administration Manual page 61

Configuring the Voice Settings
SIP
Cisco SPA100Series Administration Guide
Field
EXT IP
EXT RTP Port Min
NAT Keep Alive
Intvl
Redirect Keep
Alive
Linksys Key System Parameters
Field
Linksys Key
System
Multicast Address
Key System Auto
Discovery
Description
External IP address to substitute for the actual IP address
of the ATA in all outgoing SIP messages. If 0.0.0.0 is
specified, no IP address substitution is performed.
If this parameter is specified, the ATA 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.
This option requires that you have (1) a static IP address
from your Internet Service Provider and (2) an edge device
with a symmetric NAT mechanism. If the ATA is the edge
device, the second requirement is met.
Default setting: 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.
Default setting: blank
Interval between NAT-mapping keep alive messages.
Default setting: 15
Interval between NAT Redirect keep alive messages.
Default setting: 15
Description
To enable operation with the Cisco SPA9000, choose yes.
Otherwise, choose no.
Default setting: no
The multicast address for devices in the Cisco SPA9000
voice network.
Default setting: 224.168.168.168:6061
To enable auto-discovery of the Cisco SPA9000 voice
system, choose yes. Otherwise, choose no.
Default setting: yes
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