Cisco SPA112 Administration Manual page 60

Configuring the Voice Settings
SIP
Cisco SPA100Series Administration Guide
Field
Insert VIA
received
Insert VIA rport
Substitute VIA
Addr
Send Resp To Src
Port
STUN Enable
STUN Test Enable
STUN Server
Description
Inserts the received 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.
Default setting: no
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.
Default setting: no
Lets you use NAT-mapped IP:port values in the VIA header.
Select yes or no from the drop-down menu.
Default setting: no
Sends responses to the request source port instead of the
VIA sent-by port. Select yes or no from the drop-down
menu.
Default setting: no
Enables the use of STUN to discover NAT mapping. Select
yes or no from the drop-down menu.
Default setting: no
If the STUN Enable feature is enabled and a valid STUN
server is available, the ATA 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 detects symmetric NAT or a
symmetric firewall, NAT mapping is disabled.
Default setting: no
IP address or fully-qualified domain name of the STUN
server to contact for NAT mapping discovery.
Default setting: blank
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