How do you greet on the phone?

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Do you usually greet your caller when you pick up the phone at work, not knowing who the person is? If yes, is it you or the caller greet first? Or you greet only if your caller greet you? Do you think it's rude not to greet back the caller if he/she greets you? I've this weird habit. If it's in the morning, I'll automatically say "Hello, morning ~".If it's in the afternoon, I'll say "Hello ~ " in a nice voice, forgetting the "good afternoon" part. The reason for this is "good afternoon" is a longer word to say. Shame to admit that I'm lazy to speak up. How about you?