Instruction Manual

FIRMWARE VERSION 1.0.9.1 HT503 USER MANUAL Page 46 of 59
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 subscriber’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
URI format, then this option needs to be selected.
SIP Registration
Controls whether the HT503 needs to send REGISTER messages to the proxy server.
The default setting is Yes.
Unregister on Reboot
Default is No. If set to Yes, the SIP user’s registration information will be cleared on
reboot.
Outgoing Call Without
Registration
Default is No. If set to “Yes,” user can place outgoing calls even when not registered (if
allowed by ITSP) but is unable to receive incoming calls.
Register Expiration
This parameter allows the user to specify the time frequency (in minutes) the HT503
refreshes its registration with the specified registrar. The default interval is 60 minutes
(or 1 hour). The maximum interval is 65535 minutes (about 45 days).
SIP registration failure
retry wait time
This parameters allows the user to specify the time frame (in seconds) the HT503 will
wait before sending another SIP registration INVITE in case the first INVITE fails.
Local SIP Port
Defines the local SIP port the HT503 will listen and transmit. The default value for FXS
port is 5062.