2N NetStar Admin manual - Manual (Page 59)

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IP filter
The parameter helps you secure your PBX system against unauthorised call setup
attempts via the given SIP gateway. Tick off this option to make your PBX process
requests from trustworthy IP addresses only. Click on the buttons to the right of the IP
address list or open the context menu in the IP address list using the right mouse
button to add, remove or modify an IP address.
RTP interface
Name – shows the name of the Ethernet interface (VoIP card) used.
UDP min – here define the lower limit for the UDP ports used for RTP stream
sending.
UDP max – here define the upper limit for the UDP ports used for RTP stream
sending.
NAT – enable RTP stream routing through the NAT. If this selection is No, the
opponent's RTP stream is sent to the VoIP interface. If a PBX is configured behind
the NAT, one of the options in this menu has to be used for the VoIP interface to
send a correct IP address to the WAN.
NAT source – if you have entered the fixed IP address in the NAT column, now
fill in the NAT IP address here for RTP streaming.
NAT base – if you have entered the fixed IP address in the NAT column, now fill
in the NAT port here for RTP streaming.
Codecs
Supported – here find a list of supported codecs excluding the codecs that have
been selected as Allowed.
Allowed – here find a list of codecs to be used for communication on this virtual
port. The context menu under the right–hand mouse button provides further
options. Codec setting
DTMF according to RFC2833 – use this option to enable DTMF transmission
according to RFC2833. With this option on, you can set the Payload type for
DTMF transmission using the link below the name.
Fax T.38 – use this option to enable fax transmission according to the T.38
recommendation. If checked off, a link becomes available to the Advanced
settings. The recommended setting is
– , – TCF Transfer Error correction
and . Redundancy No compression
FAX detection – set whether 2N® NetStar shall detect FAX (send the re-INVITE
message with T.38 in SDP) for Incoming and/or outgoing fax messages, Always
or Never.
NetStar versions 2.6.0 and higher also support DTMF sending through SIP
Info. This function requires no setting.