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NAT - Voice (RTP) UDP Port No.
Specifies the starting port number of the dynamic ports used for NAT Traversal.
Value Range
2–65000 (even number only)
NAT - Keep Alive Packet Sending Ability
Specifies whether to send Keep Alive packets in order to maintain the NAT binding information. This setting
may be compulsory depending on the network conditions.
Value Range
Disable, Enable
NAT - Keep Alive Packet Type
Specifies the type of Keep Alive packets to be sent out.
Value Range
Blank UDP, None
NAT - Keep Alive Packet Sending Interval
Specifies the interval time until the next Keep Alive packet is sent.
Note
It is required to set this interval shorter than the NAT binding time of the router. The default value is
appropriate in most cases.
Value Range
1–60 s
NAT - Fixed Global IP Address
Specifies the global IP address of the router with NAT enabled. This setting is compulsory if Fixed IP Addr.
is selected in NAT Traversal.
Value Range
1.0.0.0–223.255.255.255
STUN Ability
Specifies whether to open a protocol port of the STUN server to enable STUN feature.
Value Range
Disable, Enable
STUN Client Port Number
Specifies the port number of the PBX used for communications with the STUN server.
Programming Manual for Virtual SIP Trunk Card 43
3.3.1 Main