3Com V6100, User Manual Manual, Page: 159 / 496

V6100 and V7122 User Guide
159
ini File Field Name
Web Parameter Name
Valid Range and Description
EnableRport Enables / disables the usage of the ‘rport’ parameter in the
Via header.
0 = Enabled.
1 = Disabled (default).
The gateway adds an ‘rport’ parameter to the Via header field
of each outgoing SIP message. The first Proxy that receives
this message sets the ‘rport’ value of the response to the
actual port from which the request was received. This
method is used, for example, to enable the gateway to
identify its port mapping outside a NAT.
If the Via doesn’t include ‘rport’ tag, the destination port of the
response will be taken from the host part of the VIA.
If the Via includes ‘rport’ tag with no port value, the
destination port of the response will be the source port of the
incoming request.
If the Via includes ‘rport’ tag with a port value (rport=1001),
the destination port of the response will be the port indicated
in the ‘rport’ tag.
EnableIPAddrTranslation 0 = Disable IP address translation.
1 = Enable IP address translation for RTP, RTCP and T.38
packets (default).
2 = Enable IP address translation for ThroughPacket™.
3 = Enable IP address translation for all protocols (RTP,
RTCP, T38 and ThroughPacket™).
When enabled, the gateway compares the source IP address
of the first incoming packet, to the remote IP address stated
in the opening of the channel. If the two IP addresses don’t
match, the NAT mechanism is activated. Consequently, the
remote IP address of the outgoing stream is replaced by the
source IP address of the first incoming packet.
The NAT mechanism must be enabled for this
parameter to take effect (DisableNAT = 0).
EnableUDPPortTranslation 0 = Disable UDP port translation (default).
1 = Enable UDP port translation.
When enabled, the gateway compares the source UDP port
of the first incoming packet, to the remote UDP port stated in
the opening of the channel. If the two UDP ports don’t match,
the NAT mechanism is activated. Consequently, the remote
UDP port of the outgoing stream is replaced by the source
UDP port of the first incoming packet.
The NAT mechanism and the IP address translation
must be enabled for this parameter to take effect
(DisableNAT = 0, EnableIpAddrTranslation = 1).