Y-Zer myself and I do the same thing. I never initiate the communication when called unless I am expecting it or I know who the caller is. Otherwise, they'll know when someone picked up because their side will stop ringing, and they'll only get awkward silence until they start talking. Often times it's an automated voice system that will not begin until prompted by the callee, so it hits a timeout and hangs up.

The number of calls I get where it's either dead silence in the other end or clearly a call center based on the noise can only be categorized as "too much".