[BUG] Phone calls merge calls

[juuushiro]

Describe the bug I can merge 2 or more calls at the same time To Reproduce Try to merge 2 diferent calls on the same call

Expected behavior A clear description of what you expected to happen. Be able to talk with 2 diferent persons at the same time

Screenshots Add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Model: [e.g. G950F]

Additional context

• Gather logs by using LoggingKit when applicable