XONTEL XonTel XT- 60 PBX, Руководство администратора

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3) External Host
Figure 9-4 NAT Settings
– External Host
Table 9-7 External Host Configuration Parameters
Codec
A codec is a compression or decompression algorithm that used in the transmission of voice packets
over a network or the Internet. XonTel XT-60/XT-120 supports G711 a-law, u-law, GSM, H261, H263,
H263P, H264, SPEEX, G722, G726, ADPCM, G719A, MPEG4 and iLBC.
Note:
If you would like to use G.729, please enter your license. The system have embedded the G729, you
Option Description
External Host Alternatively you can specify an external host, and the
system will perform DNS queries periodically.
This setting is only required when your external IP address
is not static. It is recommended that a static public IP
address be used with this system. Please contact your ISP
for more information.
External Refresh Interval If an external host has been supplied, you may specify how
often the system will perform a DNS query on this host.
This value is specified in seconds.
Local Network Identification Used to identify the local network using a network
number/subnet mask pair when the system is behind a
NAT or firewall. Some examples are as follows:
“192.168.0.0/255.255.0.0”, “10.0.0.0/255.0.0.0”, and
“172.16.0.0/12”.
NAT Mode Global NAT configuration for the system. The options are
as follows:

Yes: use NAT and ignore the address information in
the SIP/SDP headers and reply to the sender's IP
address/port.

No: use NAT mode only according to RFC3581.

Never: never attempt NAT mode or RFC3581 support.
Route: use NAT but do not include rport in headers.