I don't mind the calls people receive in the office, I do mind most of the
ringtones at a high decible. What's wrong with a simple default ringtone?
If I am in a meeting and someone's cellphone starts "ringing" with a
melody or some other peculiar sound, I think it's highly unprofessional.
We actually had a collegue whose ringtone was the Mission Impossible
themesong
Just this morning I met with a commercial realtor to look at some office
space and when his cell phone started ringing, I didn't mind at all, it
was a regular ringtone and he immediately said to the caller, he would
call back, he's in an important meeting. Afterwards he apologized for
the interruption to me. Perfectly acceptable.