Settings/Sip/Sip - Grandstream Networks GVC3200 Administration Manual

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-Require proxy-sensitive features that must be supported by the proxy. Do not configure this
parameter unless this feature is supported on the SIP server.

Settings/SIP/SIP

Parameters Descriptions
It is used to set if allowing the device to send SIP Register messages to the
SIP Registration
proxy/server. The default setting is "Yes".
If it is set to "All", the SIP user's registration information will be cleaned when the
Unregister Before device starts pre-registration after rebooting. The SIP Contact header will contain "*"
New Registration 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".
It is used to configure the time period (in minutes) in which the device refreshes its
Register
registration with the specified registrar. The default setting is 60. The maximum value
Expiration (Min.)
is 64800 (about 45 days) and the minimum value is 1 minute.
It is used to configure the time period (in seconds) in which the device will retry the
Wait Time Retry
registration process in the event that is failed. The default setting is 20. The maximum
Registration (s)
value is 3600 (1 hour).
It is used to configure the local SIP port used to listen and transmit. The default setting
Local SIP Port
is 5060. The valid range is from 5 to 65535.
It is used to set if the device will subscribe voice message service. If it is set to "Yes",
SUBSCRIBE for the device will periodically send SIP SUBSCRIBE message for Message Waiting
MWI Indication service. GVC3200/GVC3202 supports both synchronized and non-
synchronized MWI. The default setting is "No".
GVC3200/3202 Administration Guide
Version 1.0.3.64
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