Grandstream Networks GSC3570 User Manual page 41

This parameter configures whether the NAT traversal mechanism is activated. Users could select the
mechanism from No (Default), STUN, Keep-alive, UPnP, Auto or VPN.
If set to "STUN" and STUN server is configured, the GSC3570 will route according to the STUN server. If NAT
NAT type is Full Cone, Restricted Cone or Port-Restricted Cone, the GSC3570 will try to use public IP addresses and
Traversal port number in all the SIP&SDP messages.
The GSC3570 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 "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.
Proxy- A SIP Extension to notify the SIP server that the Intercom is behind a NAT/Firewall. Do not configure this
Require parameter unless this feature is supported on the SIP server.
Account x
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Settings
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Settings
If the GSC3570 has an assigned PSTN phone number, this field should be set to "user=phone".
Then a "user=phone" parameter will be attached to the Request-Line and "TO" header in the SIP request to
TEL URI
indicate the E.164 number.
If set to "Enabled", "Tel:" will be used instead of "SIP:" in the SIP request. The default setting is "Disable".
SIP
Registrati Selects whether the GSC3570 will send SIP Register messages to the proxy/server. The default setting is "Yes".
on
Allows the SIP user's registration information to be cleared when the GSC3570 reboots. The SIP REGISTER
message will contain "Expires: 0" to unbind the connection. Three options are available: The default setting is
"No".
Unregiste
r on
If set to "All", the SIP user's registration information will be cleared when the GSC3570 reboots. The SIP
Reboot
Contact header will contain "*" to notify the server to unbind the connection.
If set to "Instance", the SIP user will be unregistered on current GSC3570 only.
If set to "No", the GSC3570 will not unregister the SIP account when rebooting.
Specifies the frequency (in minutes) in which the GSC3570 refreshes its registration with the specified registrar.
Register
The default value is 60 minutes.
Expiratio
n
The maximum value is 64800 minutes (about 45 days).
Subscribe
Specifies the frequency (in minutes) in which the GSC3570 refreshes its subscription with the specified
Expiratio
registrar. The maximum value is 64800 (about 45 days). The default value is 60 minutes.
n
Reregister
Before Specifies the time frequency (in seconds) that the GSC3570 sends re-registration request before the Register
Expiratio Expiration. The default value is 0.
n
Enable
OPTIONS
Enable OPTIONS Keep Alive to check SIP Server.
Keep
Alive