Grandstream Networks HT502 User Manual page 41

SIP transport
NAT Traversal (STUN)
SIP User ID
Authenticate ID
Authenticate Password
Name
DNS Mode
Primary IP
Backup IP1
Backup IP2
Tel URI
SIP Registration
FIRMWARE VERSION 1.0.12.4
environments. If symmetric NAT is detected, STUN will not work and ONLY outbound
proxy can correct the problem.
User can select UDP or TCP or TLS.
This parameter defines whether or not the HT502 NAT traversal mechanism is
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.
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 identical to or
different from SIP User ID.
SIP service subscriber's account password.
SIP service subscriber's name for Caller ID display.
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"
Configure the primary IP for DNS Mode: Use Configured IP
Configure the first backup IP for DNS Mode: Use Configured IP
Configure the second backup IP for DNS Mode: Use Configured IP
The default setting is "Disabled". If the phone has an assigned PSTN
Number, this field should be set to "User=Phone" then a
"User=Phone" parameter will be attached to the "From header" in the SIP
request to indicate the E.164 number. If server supports TEL URI format, then this
option needs to be selected.
Controls whether the HT502 needs to send REGISTER messages to the proxy server.
HT502 USER MANUAL Page 39 of 54