248 Matrix ETERNITY NE System Manual
If your router as asymmetric NAT, configure the following STUN parameters:
1. In the field STUN Server Address: Port,
• Enter the STUN Server Address, a maximum of 40 characters.
• Enter the Listening Port of the STUN Server in the field STUN Port. The valid range for this field is from
1024-65535. The default STUN Port is 03478.
2. To allow the SIP Port number to be fetched using STUN in the SIP message, you must enable Use SIP
Port fetched using STUN. Default: enabled.
If you are using Port-Forwarding in the Router for SIP messages, disable Use SIP Port fetched using
STUN by clearing the check box.
You also need to select 'Use IP Address fetched using STUN’ as the 'Source Port IP Address' in the 'SIP
Extension General Parameters', when you configure SIP Extensions'. Refer the topic "Configuring SIP
Extensions".
Since STUN does not work with symmetric NAT, as an alternative to STUN you can use the Router's Public
IP Address as NAT Traversal mechanism. Ask your Network Administrator about the NAT Traversal
mechanism that suits best for your voice network and configure this parameter.
MAC Address Selection
By default, ETERNITY NE uses the unique MAC Address of its Ethernet Port on all ethernet frames. If you want the
system to use a Clone MAC Address, configure MAC Address Selection.
• Select the MAC Address Selection check box. Default: Disabled.
• In the Clone MAC Address field, enter the Clone MAC Address (in hexadecimal format) to be used on all
ethernet frames.
DHCP Server
ETERNITY NE has an in-built DHCP server for registering the Matrix Extended IP Phones. Configure DHCP Server
settings if you are connecting Extended IP Phones.
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