Call Fall Sip Trunk

hello I have a small problem with my pbx and incoming calls through the trunk. the calls leave normally towards telephone numbers. the problem is when calls call me enter my pbx and in the input path I have the extension 9152, the phone rings then when I answer it hangs alone. I communicate with the provider they tell me to check my pbx because they are all right on their part they say that when that happens my pbx responds with a “bye”. I would appreciate your help since I am new to this.

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