I have 2 DP720 and one DP750 to connect to a local Asterisk server (running FreePBX) and everything works fine. I created an extension in Asterisk and pointed the DP750 to this extension and Viola! The DP750 firmware update was a bit strange. I had to change "Firmware Server Path" to "firmware.grandstream.com", save and reboot. Then after a while I clicked my mouse and he didn't answer because I think he finally downloaded the firmware. Anyway, once it was updated, both phones were updated one by one. As long as I like it
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