Free-PBX no ring tone for ring groups with PCMA / PCMU

I have found a problem today. When i call a ring group from another place i can’t hear the ring sound. After a while the person on the other site it take up the phone and he is available. So this appears only when i call from a telephone with lower codecs i think. When i call with my smartphone the same number i hear the ringing sound.

So it seems that there is something broken. I have seen that here are a lot of thickets with that problem but no one of the solutions work.

Does anyone know how to solve the problem? I’m sure that this is new. The same problem we have when we call outside to other customers. It’s possible that the counter starts to run but you can’t hear it ringing.

When i call the phone directly without the Ring-Group it’s ringing perfectly.

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