I agree with above - everything is VERY picky when it comes to dpi of the file, that the image is the right type (mono), file size, etc. There is a document out there if you don't have it - I think it's on thw unify wiki that explains the logo requirements. If I can find it I'll post it. I had a lot of trouble when we first worked on logos for our company - it was very hard to get a logo our size to not look crappy on the phone.
Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA