Grandstream Networks DP720 Administration Manual page 35

Specifies backup IP 2 address where the base sends DNS query to, when "Backup IP 1" is
Backup IP 2
not responding.
Enables/disables NAT traversal mechanism. If activated (by choosing "STUN") and a STUN
NAT Traversal
server is also specified (Maintenance > Network Settings > STUN Settings); the base
performs according to STUN client specification. Under this mode, embedded STUN client
will detect if and what type of firewall/NAT is being used. If detected NAT is a Full Cone,
Restricted Cone, or a Port-Restricted Cone, the base will use its mapped public IP address
and port in all of its SIP and SDP messages.
If NAT Traversal field is set to "Keep Alive", the base will periodically (every 20 seconds)
send a blank UDP packet (with no payload data) to SIP proxy to keep the "ping hole" on the
NAT open.
Use NAT IP Defines NAT IP address used in SIP/SDP messages. It should only be used if required by
ITSP.
Proxy-Require Determines a SIP Extension to notify the SIP server that the base is behind a NAT/Firewall.
SIP Settings – Basic Settings
SIP transport Selects transport protocol for SIP packets; UDP or TCP or TLS. Please make sure your SIP
server or network environment supports SIP over the selected transport method. Default is
UDP.
SIP Registration Controls whether to send SIP REGISTER messages to the proxy server. Device may not be
able to make/receives calls if disabled. Default is Yes.
Controls whether to clear SIP user's information by sending un-register request to the proxy
Unregister on Reboot
server. The un-registration is performed by sending a REGISTER message with "Contact"
header set to * and Expires=0 parameters to the SIP server. This will unregister all SIP
accounts under the concerned Profile. Default is No.
Adds "Authentication" header with blank "nonce" attribute in the initial SIP REGISTER
Add Auth Header on
Initial REGISTER request. Default is No.
Outgoing Calls
Enables the ability to place outgoing calls even when not registered (if allowed by ITSP);
Without Registration
device will not be able to receive incoming calls. Any HS member of a hunting group that is
not registered with a SIP account, will be able to place outbound calls using the SIP
credentials of the primary hunting group HS. Default is No.
For example: HS 1, 3 and 5 are members of the same Hunting Group. HS 1 is registered
with a SIP account. HS 3 and 5 are not registered. HS 3 and 5 will be able to place
outbound calls using the SIP account of HS 1, even if Outgoing Call without Registration
is set to No.
DP750/DP720 Administration Guide
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