I was just browsing the 'net and found this old photograph.

Is it me or does this scream "Vox Caster" to you? Of course, it should be a backpack rather than a suitcase, and include an earphone and microphone rather than a telephone-like headset; but I can imagine a guild representative carrying around a briefcase vox caster (or getting a lackey to carry it for him), a techpriest having something like this as part of his body's augmentation, or even something like this being a pannier on a hiveworld motorcycle.
By the way, this was one of the early "mobile phones" if you were wondering. The plaque reads "Briefcase Cellular Telephone".


