Hello Amir,
did you check the application settings? Maybe the audio volume is too high such that it immediately (after the defined switch on delay) triggers the call notification?
If you still think on a application bug, please provide more details (such as a screenshot before triggering).
Regards, Roman

Sounds great, 11 years to late.
I had programed this on Windows 95 this time. A N900 would have been nice:-)