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Users range from small, local organizations needing to contact members to large firms and call centers needing to call their customers using a predictive dialing system.
No hard and fast requirements, but preferable that the logo fits in existing header.
LATE ADDITION: I have decided that I would prefer a logo with the words "Live Telemarketing" on the same line. Of course, if you have a design that has the words on two lines, feel free to submit it, but be aware that my preference is now a strong one, and two line designs are very likely to score low or be eliminated.
Also, there is no need to provide screenshots - the header of the site, and perhaps the whole site, will be redesigned to work with the new logo, so screenshot mockups are not really helpful.