Important requirement would be that it looks good on websites, smartphones (with the help of an icon) and on printed material (business cards, company letter head). An accompanying image with the same logo as a smartphone app would get much better/positive feedback.
No other hard and fast requirements as such. Would love creativity in the logo along with nice vibrant colors. A tagline of "Voice to Infinity" would be nice to include in the logo, if possible. Not a requirement though by any means.
The next step is to come up with a new Web-2.0 style website, so its very important that the logo is extremely nice and intuitive.
Please feel free to experiment with colors!
The files we will require are:
Print file format - .ai (CMYK)
Web file format - .jpg and layered .psd (RGB)
Please do not use any stock images or clip art in the logo