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V6100 and V7122 User Guide
On startup the gateway sends a STUN Binding Request. The information received in the
STUN Binding Response (IP address:port) is used for SIP signaling. This information is
updated every NATBindingDefaultTimeout.
At the beginning of each call, if STUN is needed (i.e., not an internal NAT call), the media
ports of the call are mapped. The call is delayed until the STUN Binding Response (that
includes a global IP:port) for each media (RTP, RTCP and T.38) is received.
To enable STUN:
Set the parameter EnableSTUN to 1
Determine the IP address of the primary and (optionally) the secondary, STUN servers
using the parameters STUNServerPrimaryIP and STUNServerSecondaryIP. If the
primary STUN server isn’t available, the gateway tries to communicate with the
secondary server.
Use the parameter NATBindingDefaultTimeout to determine the default NAT binding
lifetime in seconds. STUN is used to refresh the binding information after this time
expires.
STUN only applies to UDP (doesn’t support TCP and TLS).
STUN can’t be used when the gateway is located behind a symmetric NAT.
First Incoming Packet Mechanism
If the remote gateway resides behind a NAT device, it’s possible that the V7122 can activate
the RTP/RTCP/T.38 streams to an invalid IP address / UDP port. To avoid such cases, the
V7122 automatically compares the source address of the incoming RTP/RTCP/T.38 stream
with the IP address and UDP port of the remote gateway. If the two are not identical, the
transmitter modifies the sending address to correspond with the address of the incoming
stream. The RTP, RTCP and T.38 can thus have independent destination IP addresses and
UDP ports.
Users can choose to disable the NAT mechanism by setting the
ini
file parameter
‘DisableNAT’ to 1. The two parameters ‘EnableIpAddrTranslation’ and
‘EnableUdpPortTranslation’ enable users to specify the type of compare operation that takes
place on the first incoming packet. To compare only the IP address, set
‘EnableIpAddrTranslation = 1’ and ‘EnableUdpPortTranslation = 0’. In this case, if the first
incoming packet arrives with only a difference in the UDP port, the sending addresses won’t
change. If both the IP address and UDP port need to be compared, then both parameters
need to be set to 1.
Содержание TP-1610
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