AEQ
PHOENIX MERCURY
17
3.3. NAT TRAVERSAL.
NAT Traversal is a set of tools used by the equipment in order to surpass the NAT (Network
Address Translation) performed by some routers. We can select among several modes
depending on the kind of network the unit is connected to.
Phoenix MERCURY offers a total of six different operating modes when traversing devices with
NAT (routers, firewalls…). Each one of those modes is suitable for a different scenario. For
instance, when the units that are establishing communication are in the same local network, the
internal working way will be different than when it’s done through the Internet.
Four of the six modes are automatic (AUTO 1 - AUTO 4), another one is manual (MANUAL -
router configuration) and the last one (OFF - there is no NAT) is used when no devices with
NAT are crossed (the unit is in a local network or connected to the Internet with a single
workstation router). In automatic modes the unit tries to find out its public IP and ports without
the user help, while in manual mode the unit gets those data directly from user (and user gets it
from network administrator).
Due to the technical complexity inherent in most of the parameters involved in this NAT
TRAVERSAL menu and the importance that any modification has in the final operation of the
unit, we recommend that only highly qualified personnel in possession of all the technical
documentation and manuals work on this NAT configuration menu. For additional information,
see
ANNEXE C5.
The NAT traversal options of a codec are accessed by following this sequence from the
involved individual codec control window: “Configuration”
Æ
“General”
Æ
“I/F Setup”
Æ
“NAT
Traversal”.
Next we will describe the operation without NAT and the other five modes supported by Phoenix
MERCURY.
3.3.1. Operation without NAT:
“
OFF (there is no NAT)
“
.
The unit uses no mechanism to traverse devices with NAT. This mode will be used only to
operate in the local network (all of the SIP participants are in the same local network, including
the Proxy SIP, if we use it).
3.3.2. Manual NAT:
”
MANUAL (router configuration)
”
.
This mode will be used when the Phoenix MERCURY is in a local network with shared Internet
access, through a router that will work as NAT (Netword Address Translation). In order to use
this mode no DHCP must be used and you need to have access to router configuration (and the
knowledge to do it) or to the Network Administrator that will give us some data to be configured
in the unit and configure the router to open and redirect some IPs and ports (port forwarding).
The procedure is described in detail in the following Application Note (we recommend you to
read it when you decide to use this working mode):
AEQ PHOENIX AUDIOCODECS. APPLICATION NOTE 0 - C (Adapted to Mercury)
(Connecting AEQ Phoenix units through Internet. Complex scenario configuration. Through
LOCAL network(s), DHCP not used, manual NAT. Making use of AEQ Proxy SIP).
The eight parameters to be configured in the dialog for this mode are:
