My setup is using 6 Grandstream GXP2130s with FreePBX. Although it’s been working great for years, for the first time I tried to use the conference button on the phone. It didn’t work. I get a dial tone when I press it but the first call is not connected when I dial.
I have no idea where to look to fix this. Does anyone have any ideas?
While on first call, press conference. Dial second party. After they answer, you are speaking privately with them. Then press conference again to have a three-way call.