
FXO & FXS Impedence Setting
You can select the FXO & FXS Impedence Setting for a different country. Please leave as default unless otherwise instructed.
Options | Description  | 
  | 
  | 
FXO Port  | Select Impedence for the FXO port. (only on V211)  | 
  | 
  | 
FXS Port  | Select Impedence for the FXS port.  | 
  | 
  | 
STUN Setting
You can enable/disable the STUN feature and configure the STUN Server IP address in this page. This function can help your ATA to work properly behind a NAT device. To change these settings please follow your VoIP Service Provider’s information.
Options | Description  | 
  | 
  | 
STUN | When enabled the NetComm ATA uses STUN (Simple Transversal of UDP through NAT)  | 
  | if the unit is behind a NAT enabled router and the router has no ALG for SIP, or NONE  | 
  | to disable STUN (VoIP Gateway is not to use STUN for NAT traversal). VoIP Gateway  | 
  | also supports a proprietary implementation of NAT traversal where the Service provider  | 
  | is expected to provide some relay support. If NONE is selected, then based on the  | 
  | responses received, the VoIP Gateway will dynamically determine if the SIP Server  | 
  | supports the proprietary implementation. | 
  | Note: Even when STUN is enabled, the VoIP Gateway does an automatic detection of the presence of SIP  | 
  | ALG and disables the use of STUN. This is to avoid some media problems arising out of the behavior of  | 
  | some ALGs when STUN is used at the user end.  | 
  | 
  | 
STUN Server  | Enter the IP address or host name of the STUN server.  | 
  | 
  | 
STUN Port  | Enter the port number on which the STUN server listens for requests from the ATA.  | 
  | (default : 3478) | 
  | 
  | 
V110,V2�10P,V2�11,V220� User Guide | YML881Rev1  | 
46  | www.netcomm.com.au  |