Grandstream Networks HT503 User Manual page 66

Prefer Primary SIP
Server
Outbound Proxy
SIP Transport
NAT Traversal (STUN)
SIP User ID
Authenticate ID
Authenticate
Password
Name
DNS mode
Default is no. If set to yes it will register to Primary Server if registration with
Failover server expires
IP address or Domain name of Outbound Proxy, or Media Gateway, or
Session Border Controller. Used by HT503 for firewall or NAT penetration
in different network environments. If symmetric NAT is detected, STUN will
not work and ONLY way to correct the problem is to use the outbound proxy.
User can select UDP, TCP or TLS
This parameter defines whether or not the HT503 NAT traversal mechanism
is activated. If set to "Yes" with a STUN server also specified, the HT503
will perform according to the STUN client specification. Using 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 HT503 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 HT503 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.
The SIP service subscriber's 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 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)
One mode can be chosen for the client to look up server.
The default value is "A Record".
HT503 User Manual
P a g e | 65