[asterisk-users] Grandstream RS-232 config (slightly off-topic)

[Vieri]

I realize this may be slightly off-topic but I'm wondering if someone here can lend me a hand.

One of my GXW4008 has gone "unconfigurable" via standard HTTP (refuses connection) and I can't use the built-in IVR because I had previously disabled the "keypad update" feature. So I'm stuck with just telnet, the reset button and RS-232.

Telnet commands are very limited and I can't change SIP configuration or reset to default values (and see if that helps to bring the HTTP back up). I did try to upgrade and downgrade the firmware with no change at all.

The reset button reboots the device but doesn't restore default values! (I tried keeping it pressed for several minutes...)

So my last chance before throwing it away is to administer it via serial port. The thing is that Grandstream's official manual says that there is "an RS232 serial port for administration" but it doesn't say anything else about it (how to connect, how to change config, how to reset the device, etc). There's absolutely nothing regarding RS-232.

If someone has this or a similar device and accessed it via serial port then I'd greatly appreciate some quick tips.

Thanks,

Vieri