We have multiple customers each with a ring group that rings different brand of phones including Grandstream GRP2612W. When the call comes in and someone answers teh call, all other brand phones stop ringing but the GRP2612W phones keep ringing until someone picks up the handset and stops ringing.
We are using FreePBX 14 asterisk 13 and the Ring group is set to yes on “Mark Answered Elsewhere”.
We tried multiple tests but had no luck. We tested with firmware 126.96.36.199 and 188.8.131.52 but the problems didn’t go away. We set them on WiFi and tested and then switched to wired but had no luck. We changed the routers and still no luck. When a new call comes in all the phones in the ring group ring. When one of the phones answers the call all other phones stop ringing except the GRP2612W phones. All of our customers with that model of the phone have exact same problem.
We also tested calling into the group and stopping the call before anyone answered. All other brand phones stop ringing but the GRP2612W phones keep ringing!
Our customers are spread from East coast to west coast. Please advise. Thank you!