C
omrex
C
orporation
72
The second option, which utilizes the outgoing Directory Server “ping”
described earlier, is very useful. The interval of this ping is adjustable,
but defaults to about one minute, which is short enough to keep a hole
punched through the majority of NAT routers.
These techniques are based loosely, with enhancements, on a generic
Internet protocol called STUN (Simple Traversal of UDP through NAT).
The system works well in all environments except one—when both users
are sitting behind a symmetric NAT. In this situation calls will fail even with
Traversal Server. The only option in that environment is to resort to port
forwarding on one side of the link.
Switchboard TS is licensed to your codec when delivered from the factory.
An account on the Switchboard TS is required and can be obtained by
contacting Comrex at 978-784-1776 or 800-237-1776 or by emailing
[email protected] or [email protected].
Settings can only be changed via the
Console Connection Interface
. The
Traversal Server setup page is found in the
Traversal Server
section of the
System Settings
menu, as shown in Figure 39.
c
onFIgurIng
S
WItchboArd
t
rAverSAl
S
erver
Figure 39 - Traversal Server Settings
