Cisco SR520-FE-K9 Administration Manual page 130

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STUN Server
EXT IP
EXT RTP Port Min
NAT Keep Alive Intvl
Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models)
IP address or fully-qualified domain name of the STUN
server to contact for NAT mapping discovery.
External IP address to substitute for the actual IP
address of the SRP in all outgoing SIP messages. If
0.0.0.0 is specified, no IP address substitution is
performed.
If this parameter is specified, the SRP 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.
NOTE: 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
SRP is the edge device, the second requirement is
met.
The default is 0.0.0.0.
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.
There is no default value.
Interval between NAT-mapping keep alive messages.
The default is 15.
Configuring Voice
Configuring Voice Settings