First, I feel for you. Your situation sucks and it feels like you’re all alone. We’ve all been there. It’s time for you to step up, though, and realize that making this our problem isn’t going to solve it for you. You’ve found a solution, it may be time to try it.
This might sound harsh. That’s not my intention, but truth quickly often sounds mean. I apologize for that. Next, a couple things:
This is a user forum. If you have a problem with Sangoma, tell them. While it’s interesting and fun to whine in public, this isn’t the place for it. We’ve heard your concern and it’s now available for anyone that has this same problem. It will be as intractable for them as it was for you.
The FCCs position on this is CRYSTAL CLEAR and has not fundamentally changed in over 50 years. The INTERFERING COMPONENT is responsible for solving this problem. Yes, other companies may not have this problem, but that’s the same as saying “My friend’s car got hit by a truck so they need to pay for the hail damages to my boat.”
Sangoma has said they are compliant and has the FCC certification to prove it. The FCC has consistently said that this type of problem is an issue with the transmitter. Have you climbed up on Motorola’s back about this? Their radios are causing interference - it’s their responsibility to provide a solution.
The answer is not to your liking? Whining at us isn’t going to fix it. We’re users. We don’t work for Sangoma. We, as a group, don’t have this problem and have recommended all of the solutions we have. If the phones don’t work, send them back or switch to a different phone. If that isn’t to your liking, fix the transmission bleed. You’re the engineer here - engineer for a minute.
Having said that - I’ve been the base frequency manager for several Joint Task Forces in several places, and it’s not a new problem. There are ways to fix this issue that are outside of everyone’s control but yours. I had a similar problem with Motorola 2-meter radios and a Merlin phone system in one location, so I know what you’re up against. We ended up replacing a truck-load of 50-pair with shielded 50 and grounding a lot of lines and phones to knock down the interference. Motorola was just as unsympathetic as Sangoma is here, and the Merlin folks just laughed at us - their suggestion was “put the chargers outside the offices and don’t let them bring their radios in”. We never did eliminate the problem, but between training the grunts to not key their radios with them next to their phones (no small feat, let me tell you - you ever tried to train someone in the Army? It literally requires cartoons…) and the cable upgrades we did, we got it to the point where we only had to remind a few of them a couple times a week not to do that…
Remember, we’re here to support you, but we’re out of ideas. There’s nothing else we can do.