User can select UDP or TCP or TLS. Please make sure you’re SIP Server or
network environment supports SIP over the selected transport method. Default
is UDP.
This parameter defines whether the GXW400X NAT traversal mechanism is
activated or not. If activated (by choosing “Yes”) and a STUN server is also
specified, then the GXW400X performs according to the STUN client
specification. Under this mode, the embedded STUN client will detect if and what
type of firewall/NAT is being used. If the detected NAT is a Full Cone, Restricted
Cone, or a Port-Restricted Cone, the GXW400X will use its mapped public IP
address and port in all of its SIP and SDP messages.
If the NAT Traversal field is set to “Yes” with no specified STUN server, the
GXW400X will periodically (every 20 seconds) send a blank UDP packet (with no
payload data) to the SIP server to keep the “hole” on the NAT open.
One from the 3 modes are available for “DNS Mode” configuration:
-A Record (for resolving IP Address of target according to domain name)
-SRV (DNS SRV resource records indicates how to find services for various
protocols)
-NAPTR/SRV (Naming Authority Pointer according to RFC 2915)
-Use Configured IP (Use the three configured IP address instead of any DNS
query)
One mode can be chosen for the client to look up server.
The default value is “A Record”
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