There's actually a call feature in 1.0... it was called '/tell notification'. Of course you had to turn it on to be usefull but like someone said, <call> would only be useful if the person didn't mute sounds anyways. (And quite a few people listen to some random dupstep/rap/deathmetal/epicbossbattlesoundtrackthat'snotFFXIV while on ifrit because it 'motivates' them.)
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