Media5 Mediatrix 4104, Reference Manual

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Chapter 6 - Web Interface – Advanced STUN Configuration
120 Mediatrix 4104
Restrictions on the Media5 STUN Implementation
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The Mediatrix 4104 does not currently support NAT type discovery.
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The Mediatrix 4104 does not currently support STUN NAT binding time to live discovery.
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The Mediatrix 4104 does not currently support the TLS security mechanism.
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Due to a limitation of most routers, an RTP portal might be required in order for two units behind
the same NAT/firewall to be able to communicate with each other.
STUN Client Configuration
The STUN sub-page of the Advanced page allows you to configure the STUN client of the Mediatrix 4104.
You can also set these parameters via SNMP, as described in “Chapter 19 - STUN Configuration” on
page 285 .

To set STUN parameters:
1. In the Advanced pages, click the STUN link.
Figure 63: STUN Web Page
2. Enable the STUN client by selecting the Enable option in the STUN Activation choices.
3. Set the static STUN server IP address or Fully Qualified Domain Name (FQDN) in the STUN Server
Host field.
4. Set the static STUN server IP port number in the STUN Server Port field.
The default value is 3478 .
5. Set the maximum amount of time, in milliseconds, the Mediatrix 4104 should wait for an answer to
a STUN query sent to a STUN server in the
Query Timeout field.
Available values range from 500 ms to 10000 ms.
Caution is advised in setting long timeouts. In the advent of an unresponsive STUN server, the unit
may end up waiting a long time before it determines that a call cannot be made due to the STUN
server failure.
6. Set the amount of time, in seconds, the Mediatrix 4104 should keep a STUN query result in its
internal cache in the
Query Cache duration field.
Keeping a query in a cache helps to reduce the amount of unnecessary STUN queries when an RTP
or T.38 socket is re-used within a short period of time. Available values range from 0 s to 3600 s.
When set to 0 , the cache is disabled and the unit performs a STUN query each time a socket needs
to be used.
7. Define the interval, in seconds, at which the Mediatrix 4104 sends blank keepalive messages to
keep a firewall hole opened in the
Keepalive Interval field.
Keepalive messages are used by both the signalling protocol socket and the RTP socket to keep
those connections opened through a firewall. Available values range from 0 s to 120 s.
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