contact is for my contact information. I have various ways of being reached, all designed to be as simple as possible. While my .tel address does this perfectly, there might be a reason of why someone might need or desire more information. For example, I can provide my UK telephone number in my .tel site, but I can not stress that it is for voice only, and does not support SMS. In addition, I can not tell you that this number is from a SIP provider. The .tel site provides the basics, the .contact site goes into more details