Specifications

Matrix SETU ATA211 System Manual 71
Make sure you configure the NAT Type on the SIP Trunk as STUN. See “SIP Trunks”.
• Router's Public IP Address: Routers public IP address specifies the public IP address of the NAT router
behind which system is located. Default: Blank.
You need to configure this field only if the system is located behind the NAT router and a Static IP Address
is assigned as Public IP Address of the Router.
Make sure you configure the NAT Type on the SIP Trunk as Router’s IP Address. See “SIP Trunks”.
• UDP NAT Keep Alive: When SETU ATA211 is connected behind a NAT router and SIP messages are
transported over UDP, NAT Keep Alive messages must be sent to refresh the binding in the NAT router.
Select the UDP NAT Keep Alive check box to enable. Default: Disabled.
Select the type of Keep Alive Message to be sent. You may select either REGISTER or NOTIFY. Default:
NOTIFY.
As Interval, set the time period after which the system should send Keep Alive messages. This time period
should be less than the NAT binding timer of the router. The valid range for the UDP NAT Keep Alive
Interval is 001–999 seconds. Default: 120 seconds.
• TCP NAT Keep Alive: When SETU ATA211 is connected behind a NAT router, and SIP messages are
transported over TCP, NAT Keep Alive messages must be sent to refresh the binding in the NAT router.
Select the TCP NAT Keep Alive check box, if you want the system to send Keep Alive messages
periodically to refresh the binding in the NAT router. Default: Disabled.
As Interval, set the time period after which the system should send Keep Alive messages. This time period
should be less than the NAT binding timer of the router. The valid range for the TCP NAT Keep Alive
Interval is 0001–9999 seconds. Default: 120 seconds.
SIP