Grandstream Networks HT502 User Manual page 49

SIP transport User can select UDP or TCP or TLS.
NAT Traversal This parameter defines whether or not the HT502 NAT traversal mechanism is
(STUN) activated. If activated (by choosing "Yes") and a STUN server is also specified,
then the HT502 performs according to the STUN client specification. Using this
mode, the embedded STUN client will detect if and what type of firewall/NAT.
If the detected NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone,
the HT502 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
HT502 will periodically (every 20 seconds or so) send a blank UDP packet (with
no payload data) to the SIP server to keep the "hole" on the NAT open.
SIP User ID User account information, provided by VoIP service provider (ITSP). Usually in
the form of digit similar to phone number or actually a phone number.
SIP service subscriber's Authenticate ID used for authentication. Can be
Authenticate ID
identical to or different from SIP User ID.
Authenticate SIP service subscriber's account password.
Password
Name SIP service subscriber's name for Caller ID display.
DNS Mode 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
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