3CX conflict Facetime feature in iphone

[Svanur]

a customer just contacted us regarding his iphone, when he makes a call via facetime, the 3CX takes over... Has anyone any idea how that could be possible and what solution we could find for the issue?

 

[Vali_3CX]

Ask him to make a screen recording, upload the video on Dropbox/Google drive and share the link here - based on his description you provided here, I never heard of. Also, tell him to provide iOS version and 3CX client version (as in About)