2N TELEKOMUNIKACE a.s., www.2n.cz
68/152
Tip
You can use the domain name
for the
Registration domain (realm)
SIP
,
and
IP addresses on
proxy (IP GSM)
/
SIP proxy (GSM IP)
/
SIP registrar
condition that you complete the domain name Registration domain
and set the
properly in the
(realm)
DNS server address
Web
section. The
and
configuration Ethernet configuration
/
SIP proxy
SIP
IP addresses must be set to the default value (0.0.0.0).
registrar
NAT firewall – NAT firewall IP address.
STUN server – STUN server IP address (Simple Traversal of UDP through NATs
(Network Address Translation)) for obtaining the public IP address with which 2N
gateway operates in the Internet. You are recommended to complete this
BRI
®
field if
gateway is installed in a private network separated from the
2N BRI
®
Internet via NAT or firewall. The pre–set port for sending requests to STUN is
3478.
Next STUN request (60–6553, 0=off) [s] – update of information on the 2N BRI
®
gateway public IP address. Use this parameter to configure the frequency of
queries routed to the STUN server.
Note
In case the GSM gateway is installed behind the NAT, make proper
routing settings in the NAT router for the relevant ports (SIP, RTP,
STUN). Integrated firewalls can also affect VoIP calls!
Tip
Should you have call troubles (such as unilateral audibility, connection
errors), make sure that all the active elements on the VoIP call route
have been set properly. For easy troubleshooting, try the point–to–point
connection with the software IP phone (SJ phone, e.g.) in your PC and,
at the same time, apply network analyzer tracing (WireShark – www.
).
wireshark.org
Refer to
for easy tracing by the BRI gateway.
Subs 5.1.7
