Matrix PRASAR UCS System Manual 109
Simple Traversal of UDP through NAT (STUN) specifies the mechanism required for NAT traversal in SIP
messages. The STUN Server facilitates traversing through most NATs, except symmetric NATs. If your
router has symmetric NAT, do not program this parameter. If your router as asymmetric NAT, configure the
following STUN parameters:
• STUN Server Address: Enter the STUN Server Address, a maximum of 40 characters. Default: Blank.
• STUN Server Port: Enter the Listening Port of the STUN Server. The valid range for this field is from
1025-65535. The default STUN Port is 03478.
• STUN Query Interval (min): This is the time interval between each STUN query made for the Public IP
Address of the NAT Router. The range of this interval is from 0001 to 9999 minutes. Default: 120
minutes.
• Use SIP Port fetched using STUN: By default, this check box is selected (enabled), to allow SIP Port
Number to be fetched using STUN in the SIP message. Clear this check box, if you are using Port-
Forwarding in the Router for SIP messages.
• Use RTP Port fetched using STUN: By default, this check box is selected (enabled), to allow RTP
Port Number to be fetched using STUN in the SIP message. Clear this check box, if you are using Port-
Forwarding in the Router for SIP messages.
• You also need to select 'Use IP Address fetched using STUN'’ option as the Source Port IP Address in
SIP Trunk Parameters and select the same as the Registrar Server Address, when you configure 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 program this parameter.
Web Server Management
Click Web Server Management to expand.
• HTTPS Server Port: Enter the HTTPS Port number. Valid range: 443 or any value ranging from 1025 to
60000. Default: 443.
• SPARSH Port: Enter the SPARSH port number. The system will listen for the configuration request of the
Extended IP Phones/ VARTA clients/ Standard SIP Phones on this port. If you want any Extended IP
Phones/ VARTA clients/ Standard SIP IP Phones to auto configure with the system, you must configure
the SPARSH port value as the Server Port along with the Server Address in the Extended IP Phones/
VARTA clients/ Standard SIP IP Phones.
Valid range: 80 or any value ranging from 1025 to 60000. Default: 80.
• Secure SPARSH Port: Enter the Secure SPARSH port number if you want to auto configure the VARTA
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