Hi,
Just received recently released Grandstream handytone 286 ATA for testing.
I can call ATA from any other extensions and conversations seems to be of quite good quality. However placing calls from ATA is not possible at all to any extensions. After dialing there no indications of any kind from ATA at all. It just "hangs in there".
ATA is behind NAT, registers to an * with public IP with no problems and it uses 1.0.4.17 firmware. Web config screen has detected "firewall/NAT type is open Internet" as network firewall.
Are you able to use tcpdump on the asterisk box to capture traffic from the ATA? Or Ethereal if you have X installed on the Linux box.
It would be interesting to see if the ATA sends anything after you dial the '1234#' sequence.
On my Grandstream 101 phone I have not had any trouble placing calls. I don't have the 'Outbound Proxy' field configured, and I re-ordered the codec preferences as well. Other than that it is pretty much stock with SIP server / user and authentication configured.
-Andrew
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