Settings/Sip/Sip - Grandstream Networks GVC3200 Administration Manual

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NAT Traversal
Proxy-Require

SETTINGS/SIP/SIP

Parameters
SIP Registration
Unregister Before
New Registration
Firmware Version 1.0.1.48
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It is used to configure the NAT traversal mechanism used on the device. It can be
selected from the dropdown list:

NAT NO

STUN

Keep-alive

uPnP

Auto

VPN

TURN
If the outbound proxy is configured and used, it can be set to "NAT NO".
If set to "STUN" and STUN server is configured, the device will periodically send
STUN message to the SUTN server to get the public IP address of its NAT
environment and keep the NAT port open. STUN will not work if the NAT is
symmetric type.
If set to "Keep-alive", the device will send the STUN packets to maintain the
connection that is first established during registration of the device. The "Keep-alive"
packets will fool the NAT device into keeping the connection open and this allows
the host server to send SIP requests directly to the registered device.
If the device needs to use OpenVPN to connect to host server, please set it to
"VPN".
If the firewall and the SIP device behind the firewall are both able to use Upnp, it can
be set to "Upnp". Both parties will negotiate the port used to allow SIP packets to go
through.
If it is set to "TURN", the protocol is designed to be used as part of the ICE
(Interactive Connectivity Establishment) approach to NAT Traversal.
The default setting is "Keep-alive".
It is used to add the Proxy-Required header in the SIP message. It is used to
indicate proxy-sensitive features that must be supported by the proxy. Do not
configure this parameter unless this feature is supported on the SIP server.
Descriptions
It is used to set if allowing the device to send SIP Register messages to the
proxy/server. The default setting is "Yes".
If it is set to "All", the SIP user's registration information will be cleaned when the
device starts pre-registration after rebooting. The SIP Contact header will contain "*"
to notify the server to unbind the connection. If set to "Instance", the device only
cleans the current SIP user's info. The default setting is "Instance".
GVC3200/GVC3202 Administration Guide Page 38 of 71