Please take a look at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/serv_fea/config/
Fast Dial URL : From CCMAdmin -->service---> ip phone services , http:///ccmpd/xmlFastDials.asp
Address Book URL : From CCMAdmin -->service---> ip phone services ,
http:///ccmpd/xmlAddressBookInput.asp
1. Double check the URL stored for the IP Service.
2. Double check server parameters, especially the Parameter Name the Parameter Display Name is not as important.
3. User PIN is not the same as the user PASSWORD, make sure they are being used properly.
4. Check the CallManager web server. Is it working properly?