Grandstream HT502 User Manual - Manual (Page 41)

FIRMWARE VERSION 1.0.14.1 HT502 USER MANUAL Page 39 of 54
Failover SIP Server Failover SIP S erver’s IP address or Domain name in case primary server does not
respond.
Prefer Primary SIP
Server
Default is no. If set to yes it will register to Primary Server if registration with Failover
server expires
Outbound Proxy IP address or Domain name of Outbound Proxy, or Media Gateway, or Session Border
Controller. Used by HT502 for firewall or NAT penetration in different network
environments. If symmetric NAT is detected, STUN will not work and ONLY outbound
proxy can correct the problem.
SIP transport User can select UDP or TCP or TLS.
NAT Traversal (STUN) 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.
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.
Authenticate ID SIP service subscriber’s Authenticate ID used for authentication. Can be identical to or
different from SIP User ID.
Authenticate Password SIP service subscriber’s account password.
Name SIP service subscriber’s name for Caller ID display.
DNS Mode One from the 3 modes are av ailable 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”
Primary IP Configure the primary IP for DNS Mode: Use Configured IP
Backup IP1 Configure the first backup IP for DNS Mode: Use Configured IP
Backup IP2 Configure the second backup IP for DNS Mode: Use Configured IP