As best as I understand, that number appeared on the DC Madam's caller ID. Now I'm not sure why the blog is claiming that's Bill Clinton's number when its clearly the main number of the Park Hyatt hotel. Could Bill Clinton have been the guest at the Park Hyatt?
I suppose it's always possible, but I'm not sure how anybody would know that from the information presented.
I'll make this simple...
DC Madam answers the phone. She sees a number. She writes down the number with the client's name. She would not write down the hotel name as the client.