User`s manual

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4. Dial Flash and Gateway FXS detect and generate the Flash to PBX in Office.
Flash is mean on-hook and off-hook fast switch, on-hook and off-hook duration. It usually use
on PBX system, in place of transfer function key.
8. Why can I call out when the gateway under the NAT?
A: VoIP product almost have NAT Pass through problem. By SIP, there are many NAT Pass
through Function can solve 80% NAT Problem. You can choose STUN/Outbound Proxy/
Symmetric RTP to Pass through NAT, you don’t set any other setting (DMZ/Virtual Server) by
router side. If you use STUN/Outbound Proxy, you must have a STUN/Outbound Proxy Server to
support. If they can’t pass NAT, please open the DMZ/Virtual Server by Router/NAT/Firewall.
9. Why does the one way talk happen?
A: Generally, one way talk happen when use the different codec between VoIP device make call.
Please check and setting the same codec, most one way talk will be solved.
10. Why can I call out by Gateway?
A: Please chick your Gateway is registered SIP Proxy Server (ITSP), and chink your Internet
works fine. Gateway can’t make a call without Internet or SIP Account that from ITSP supply. You
must have a SIP account or know the other Gateway IP/Domain Name, then you can make a
VoIP call.
11. I can’t use web Interface to setting gateway. How can I do?
A: Please check you PC connect the Gateway Lan port or PC and ATA with the same Subnet. If
you PC aren’t at the same Subnet, you can’t Login the gateway Web interface. Else you let your
gateway on Public Internet(Public IP address).when you Lan and Wan can’t login always, try to
set factory default. (Push RST button until 5 second), and try again
12. Why I use asterisk by G.729 sometimes disconnect happen?
A: In asterisk setting VAD must disable, if you open Silence Compression (VAD), it will make call
disconnect happen, please disable the option when you use the asterisk.
13. Can I use re-invite function when server is asterisk?
A: No, our gateway not support this function complete, the new firmware will support re-invite.
14 Why can i register and use after setting?
A: After setting, please save configuration and reboot, after reboot you can use new
configuration.
15. Why I can’t use FAX?
A: The VoIP FAX has 2 mode, one is T.30, another is T.38. T.30 use voice date to FAX, so
usually T.30 FAX by VoIP is work. There are some problem with T.38. Because T.38 is use
protocol and data packet to sand FAX, different platform and device maybe have different change,
that made the T.38 filed. If you can use T.38 to FAX, Please try to use T.30.