Grandstream Networks GSC3516 User Manual page 24

Proxy-Require
Accounts/SIP Settings
SIP Registration
UNREGISTER on Reboot
REGISTER Expiration
SUBSCRIBE Expiration
Re-Register before Expiration
Registration Retry Wait Time
● UPnP
● Auto
● VPN
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 STUN 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 phone.
If it needs to use OpenVPN to connect host server, it needs to 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". The both parties
will negotiate to use which port to allow SIP through. The default setting is "Keep-alive".
The default settings is "Auto"
Adds 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.
Accounts – General Settings page
Basic Settings
Allows the device to send SIP REGISTER messages to the proxy/server. The default setting is
"Yes".
If set to "No", the device will not unregister the SIP user's registration information before new
registration. If set to "All", the SIP Contact header will use "*" to clear all SIP user's registration
information. If set to "Instance", the device only needs to clear the current SIP user's info
Configures the time period (in minutes) in which the device refreshes its registration with the
specified registrar. The default setting is 60. The maximum value is 64800 (about 45 days).
Specifies the frequency (in minutes) in which the device refreshes its subscription with the
specified register. The maximum value is 64800 (about 45 days).
Specifies the time frequency (in seconds) that the device sends re-registration request before the
Register Expiration. The default setting is 0. The range is from 0 to 64,800.
Configures the time period (in seconds) in which the device will retry the registration process in
the event that is failed. The default setting is 20. The maximum value is 3600 (1 hour).