PLANET VIP-350PT User Manual
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STUN
Simple Traversal of UDP through NATs (STUN) is a lightweight protocol that allows applications to
discover the presence and types of Network Address Translators (NATs) and firewalls between
them and the public Internet. It also provides the ability for applications to determine the public IP
addresses allocated to them by the NAT.
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STUN Server
Configure the Simple Traversal of UDP through NAT protocol server. You may use a dotted IP or a
DNS name. If you fill in the DNS name, such as “isp.com”, IP Phone will try to locate the STUN
server of “isp.com” domain via DNS SRV query (_stun._udp.isp.com). If the STUN SRV record
query failed, the IP Phone will use the IP of “isp.com” as the default STUN server with UDP port
3478. Therefore, if the DNS returns more than one STUN SRV records, IP Phone will switch to the
secondary STUN server whenever it fails to reach the primary STUN server (STUN server
redundancy). Besides, IP Phone will switch between STUN servers only if it fails to reach the
primary STUN server for more than 30 seconds to avoid instability in switching back and forth.
Default is “larry.gloo.net”.
To use a different STUN server port other than the default UDP port 3478, please specify it in the format
like “STUN.isp.com:8888” or “172.16.0.1:8888”.
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