Cisco SPA2102 Administration Manual page 131

ATA Voice Field Reference
SIP page
Cisco Small Business ATA Administration Guide
Insert VIA rport
Substitute VIA Addr Lets you use NAT-mapped IP:port values in the VIA header.
Send Resp To Src
Port
STUN Enable
STUN Test Enable
STUN Server
EXT IP
Inserts the parameter into the VIA header of SIP
responses if the received-from IP and VIA sent-by IP
values differ. Select yes or no from the drop-down menu.
The default is no.
Select yes or no from the drop-down menu.
The default is no.
Sends responses to the request source port instead of the
VIA sent-by port. Select yes or no from the drop-down
menu.
The default is no.
Enables the use of STUN to discover NAT mapping. Select
yes or no from the drop-down menu.
The default is no.
If the STUN Enable feature is enabled and a valid STUN
server is available, the ATA device 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 ATA device detects symmetric NAT or a
symmetric firewall, NAT mapping is disabled.
The default is no.
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 ATA device 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 device 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.
The default is 0.0.0.0.
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