Configuring Network
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Restricted Cone:
A restricted cone NAT is one where all requests from the same internal IP address and port are
mapped to the same external IP address and port. Unlike a full cone NAT, an external host (with
IP address X) can send a packet to the internal host only if the internal host had previously sent
a packet to IP address X.
Port Restricted Cone:
A port restricted cone NAT is like a restricted cone NAT, but the restriction includes port
numbers. Specifically, an external host can send a packet, with source IP address X and source
port P, to the internal host only if the internal host had previously sent a packet to IP address X
and port P.
Symmetric:
A symmetric NAT is one where all requests from the same internal IP address and port, to a
specific destination IP address and port, are mapped to the same external IP address and port. If
the same host sends a packet with the same source address and port, but to a different
destination, a different mapping is used. Furthermore, only the external host that receives a
packet can send a UDP packet back to the internal host.
Rport
Rport in RFC 3581, allows a client to request that the server sends the response back to the
source port from which the request came. Rport feature depends on support from a SIP server.
The rport parameter on the endpoint is described below:
Enables or disables NAT Rport
feature. You can configure it for the
SIP account or SIP IP call separately.
Default: Enabled
To configure rport feature for SIP account via web user interface:
1. Click on Account->SIP Account.
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