Cisco SPA2102-SF Administration Guide - Page 232

STUN Enable, STUN Server, STUN Test Enable

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Troubleshooting C 4. Add a STUN server to allow traversal of UDP packets through the NAT device. On the SIP tab of the administration web server, set STUN Enable to yes, and enter the IP address of the STUN server in STUN Server. STUN (Simple Traversal of UDP through NATs) is a protocol defined by RFC 3489, that allows a client behind a NAT device to find out its public address, the type of NAT it is behind, and the port associated on the Internet connection with a particular local port. This information is used to set up UDP communication between two hosts that are both behind NAT routers. Open source STUN software can be obtained at the following website: http://www.voip-info.org/wiki-Open+Source+VOIP+Software NOTE STUN does not work with a symmetric NAT router. Enable debug through syslog (see FAQ#10), and set STUN Test Enable to yes. The messages indicate whether you have symmetric NAT or not. Cisco Small Business ATA Administration Guide 232

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Troubleshooting
Cisco Small Business ATA Administration Guide
232
C
4.
Add a STUN server to allow traversal of UDP packets through the NAT device.
On the SIP tab of the administration web server, set
STUN Enable
to
yes
, and
enter the IP address of the STUN server in
STUN Server
.
STUN (Simple Traversal of UDP through NATs) is a protocol defined by RFC
3489, that allows a client behind a NAT device to find out its public address, the
type of NAT it is behind, and the port associated on the Internet connection
with a particular local port. This information is used to set up UDP
communication between two hosts that are both behind NAT routers. Open
source STUN software can be obtained at the following website:
NOTE
STUN does not work with a symmetric NAT router. Enable debug through
syslog (see FAQ#10), and set
STUN Test Enable
to
yes
. The messages
indicate whether you have symmetric NAT or not.