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Unread 08-20-2009, 06:33 PM   #2
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If your router has SPI or ALG features you may have to disable one or both of those features.

If your Grandstream Handytone 486 ATA can make a direct IP call try calling this test number: *
If the message says you are behind a SIP compatible router that means your ATA is sending your public IP address as the RTP contact address, as it should. If you hear "you may experience call completion problems behind this router" that means your ATA is not sending it's public IP address as the RTP contact address, and probably sending it's local IP address instead.

If the problem persists even when using a STUN server then try forwarding the SIP port and full range of RTP ports used by your ATA. When you forward ports you probably won't need to use a STUN server.

Last edited by boatman; 08-20-2009 at 06:40 PM.
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