Configuration via Web Interface
Commend SIP Series
38
2.0/0612
SNMP Settings
In the section
SNMP Settings
the settings required for the use of the monitoring function via the
“Simple Network Management Protocol” are entered.
SNMP enabled:
With activation of the checkbox, the SNMP function is activated.
Allowed IP:
The IP address of the PC to be authorised for monitoring the SIP station, has to be
entered (so called “management station”).
Trap Destination:
The IP address of the PC to which “traps” (station messages) shall be sent, has
to be entered.
NAT Settings
In the section
NAT Settings
the settings required for the use of the SIP devices behind a NAT, are en-
tered.
STUN enabled:
With activation of the checkbox, the STUN function is activated.
STUN Server:
Entering the IP address incl. port of the “STUN server”: <IP>:<Port> (e.g. stun.sip-
gate.net:10000).
Keep Alive Messages Enabled:
With activation of the checkbox, “dummy” data packages will be
sent regularly to the SIP Server to keep the connection over NAT open.
Note:
The definition and use of the function is explained at
”SNMP” on page 58
.
W
HAT
IS
STUN
?
S
ession
T
raversal
U
tilities for
N
AT is a network protocol, i.e. a client-server protocol based on UDP, for
detecting firewalls and NAT routers and to traverse NAT routers.
STUN detects the current IP address of the connection. Thus, e.g. a SIP telephone can detect and commu-
nicate its own current IP address. This is important, in order the conversation partner is able to address its
conversation data correctly.
Therefore, a request to a server (“STUN server”) is sent. The answer of the server includes a public “IP
address”, i.e. the IP address and the sender UDP port of the SIP device (“client”). This address is coded
with a XOR mask, to avoid a translation of the address via a NAT router.
Note:
These dummy packages are sent constantly, i.e. no matter if actions are carried out at the station.
