Account/Sip Settings; Firmware Version 1.0.1.27 - Grandstream Networks GXV3240 Administration Manual

Secondary Outbound Proxy
DNS Mode
NAT Traversal
Proxy-Require

ACCOUNT/SIP SETTINGS

SIP Registration
Unregister Before New
Registration
Register Expiration (m)

Firmware Version 1.0.1.27

symmetric NAT is detected, STUN will not work and ONLY an Outbound
Proxy can provide a solution.
IP address or Domain name of the Secondary Outbound Proxy, Media
Gateway, or Session Border Controller. Secondary outbound proxy will
be used when the primary outbound proxy fails.
This parameter controls how the Search Appliance looks up IP
addresses for hostnames. There are three modes: A Record, SRV,
NATPTR/SRV. The default setting is "A Record". If the user wishes to
locate the server by DNS SRV, the user may select "SRV" or
"NATPTR/SRV".
This parameter configures whether the NAT traversal mechanism is
activated. Users could select the mechanism from NAT NO, STUN,
Keep-alive, UPnP, Auto or VPN.
If set to "STUN" and STUN server is configured, the phone will route
according to the STUN server. If NAT type is Full Cone, Restricted Cone
or Port-Restricted Cone, the phone will try to use public IP addresses
and port number in all the SIP&SDP messages. The phone will send
empty SDP packet to the SIP server periodically to keep the NAT port
open if it is configured to be "Keep-alive". Configure this to be "NAT NO"
if an outbound proxy is used. "STUN" cannot be used if the detected
NAT is symmetric NAT. Set this to "VPN" if OpenVPN is used.
The default setting is "Keep-alive".
A SIP Extension to notify the SIP server that the phone is behind a
NAT/Firewall. Do not configure this parameter unless this feature is
supported on the SIP server.
Selects whether or not the phone will send SIP Register messages to
the proxy/server. The default setting is "Yes".
If set to "Yes", the SIP user's registration information will be cleared
when the phone reboots. The SIP Contact header will contain "*" to
notify the server to unbind the connection. The default setting is "No".
Specifies the frequency (in minutes) in which the phone refreshes its
registration with the specified registrar. The default setting is 60. The
maximum value is 64800 minutes (about 45 days).
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