See also:

Malfunction
Comfort Access may not function properly if it experiences interference from external sources such as mobile phones, metal objects, overhead power lines, transmission towers, etc. In this case, ...

Calls with multiple participants
General information You can switch between calls or connect two calls to a single conference call. These functions must be supported by the mobile phone and service provider. Accepting a call ...

Opening and closing: from the inside
Opening and closing: from the inside ...