Grandstream HT503 User Manual - Manual (Page 51)

FIRMWARE VERSION 1.0.14.1 HT503 USER MANUAL Page 49 of 64
TABLE 11: FXO PORT SETTINGS
Account Active When set to “Yes” the FXO port is activated.
SIP Server SIP Serve r’s IP address or Domain name provided by VoIP Service Provider.
Failover SIP Server This Field contains the URL or the IP address of a second SIP server, this one will be
used in case the device loses the connection with the first server.
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 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.
SIP Transport User can select UDP, TCP or TLS
NAT Traversal (STUN) 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.
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 The SIP service subscriber’s ID used for authentication. Can be identical to or different
from SIP User ID.
Authenticate Password SIP service subsc riber’s account password.
Name SIP service subscriber’s name for Caller ID display.
DNS mode 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”.
Tel URI 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