Panasonic KX-NCP500 Programming Manual page 54

3.3.1 Main
Value Range
Off, Fixed IP Addr., STUN
NAT - Voice (RTP) UDP Port No.
Specifies the starting port number of the dynamic ports used for NAT Traversal.
Default
16000
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.
Default
Disable
Value Range
Disable, Enable
NAT - Keep Alive Packet Type
Specifies the type of Keep Alive packets to be sent out.
Default
Blank UDP
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.
Default
20 s
Value Range
1–60 s
54 Programming Manual for Virtual SIP CO Line Card Document Version 2011-10