Very bad external static noise Sangoma Vega 100G GW

I’ve been runing Sangoma Vega 100G GW as my gateway for external calls for many years now. It’s been working very well. Recently i’ve had a numerous amount of phone calls where the external caller complains all they hair is a lot of static noise masking the call. This seems to only happen with certain calls though and I can’t replicate it with my mobile. I am wondering if it’s a certain network carrier that this is effecting. This only happens to the external calls made from mobiles. Is there some setting in Sangoma Vega that I can use to help prevent this?

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