Cisco 6800 Series Administration Manual page 254

NAT Support Parameters
Parameter
Send Resp To Src Port
STUN Enable
STUN Test Enable
STUN Server
EXT IP
EXT RTP Port Min
NAT Keep Alive Intvl
Redirect Keep Alive
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
240
Description
Enables to send responses to the request source port
instead of the VIA sent-by port.
Default: No
Enables the use of STUN to discover NAT mapping.
Default: No
If the STUN Enable feature is enabled and a valid
STUN server is available, the phone can perform a
NAT-type discovery operation when it powers on. It
contacts the configured STUN server, and the result
of the discovery is reported in a Warning header in
all subsequent REGISTER requests. If the phone
detects symmetric NAT or a symmetric firewall, NAT
mapping is disabled.
Default: No
IP address or fully-qualified domain name of the
STUN server to contact for NAT mapping discovery.
You can use a public STUN server or set up your own
STUN server.
Default: Blank
External IP address to substitute for the actual IP
address of phone in all outgoing SIP messages. If
0.0.0.0 is specified, no IP address substitution is
performed.
If this parameter is specified, phone assumes this IP
address when generating SIP messages and SDP (if
NAT Mapping is enabled for that line).
Default: Blank
External port mapping number of the RTP Port
Minimum 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: 0
Interval between NAT-mapping keep alive messages.
Default: 15
If enabled, the IP phone redirects the keepalive
message when SIP_301_MOVED_PERMANENTLY
is received as the registration response.
Phone Troubleshooting