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STUN server – IP address of the STUN (Simple Traversal of UDP through NATs
(Network Address Translation)) server for obtaining the public IP address under
which
operates in the Internet network. You are advised to
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fill in this field if
operates in a private network separated
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from the Internet using the NAT or firewall. The default port for sending requests
to STUN is 3478.
Next STUN request (60–6553, 0=off) [s] – used for refreshing information on the
public IP address of
. By editing this item you can configure
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the frequency of queries sent to the STUN server.
Note
In case the GSM gateway is located behind the NAT, make sure that the
NAT router routing settings for the appropriate ports (SIP, RTP, STUN)
are made. The integrated firewalls may affect VoIP calls too!
Tip
Should there occur call errors (one-way audibility, connection errors, e.
g.), check the settings of all active elements on the VoIP call route. To
detect the problems quickly, you can test the Point-to-Point connection
with a software IP phone (SJ phone, e.g.) in your PC and use tracing by
means of a network analyser (WireShark –
e.g.) at
www.wireshark.org
the same time.
Refer to
for easy tracing through
.
Subs. 4.2
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Tones generated to VoIP
Ring tone to VoIP – generate a ringing tone of your own, or transmit a real
ringing tone from the GSM/UMTS networks.
FXS Interface
Profiles
Line impedance profile – select right impedance of analogue line (according to
region where is the gateway installed)
