Bluetooth headphone does not work with voip app on iPhone?

B

Boyang

New member
Hi,

I installed 2 voip apps on my iPhone. My Bluetooth headphone works with one app which I use to make calls in the US, but the Bluetooth headphone does not work with the other app which I use to make international calls. What is worng with the Bluetooth connection? Is it fixable? Thanx
 
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