Synway Information Engineering Co., Ltd
SMG Series Analog Gateway User Manual (Version 1.5.3)
Page 28
Figure 3-26 NAT Setting Interface
The table below explains the items shown in Figure 3-26.
Item
Description
STUN Server
Sets whether to enable the STUN server for NAT traversal. By default the STUN
server is disabled.
NAT Type
Detected NAT (Network Address Translation) type. The gateway will return the NAT
type automatically in case
STUN Server
is enabled. It includes 9 types: unknown;
no NAT; ConeNat; RestrictedNat; PortRestrictedNat; Symmetric NAT; Symmetric
NAT with firewall; can’t detect over (fail to send detect message) and fail to detect
(No reply from the stun server).
STUN Server
Address
Address of the server for STUN traversal.
Mapping Address
It should be filled in when there exists NAT or other mapping relationships which
leads to the failure of direct communication between the gateway and the
destination address, so as to ask the remote end to send signaling messages or
voice data to it during the signaling or voice communication between the gateway
and the destination.
Note:
Once this item is filled out, it will be used as the first choice even if Rport and
NAT IP are enabled.
RTP Self-adaption
When this feature is enabled, the RTP reception address or port carried by the
signaling message from the remote end, if not consistent with the actual state, will
be updated to the actual RTP reception address or port. By default, this feature is
disabled
.
Rport
When this feature is enabled, a corresponding Rport field will be added to the Via
message of SIP. The default value is
enabled
.
Auto Detect NAT IP
When this feature is enabled, the gateway will parse the corresponding address
and port in the message returned by Rport so as to use them for the following
communication. By default, this feature is
disabled
.
Note:
This feature gets valid only when Rport is enabled.
