Grandstream Networks HT701 User Manual page 45

NAT Traversal This parameter defines whether or not the HT70X NAT traversal mechanism is
(STUN) activated. If activated (by choosing "Yes") and a STUN server is also specified,
then the HT70X 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 HT70X 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
HT70X 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.
DNS Mode 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)
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 HT701 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 Default is No. If set to "Yes," user can place outgoing calls even when not
without Registration registered (if allowed by Internet Telephone Service Provider) but is unable to
receive incoming calls.
Register Expiration This parameter allows the user to specify the time frequency (in minutes) the
HT70X 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).
HT70X User manual
Version 1.0.9.4
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