go through the following steps:
On the callmanager make sure the following parameters have the IP address instead of the hostname in the URL:
System > Enterprise Parameters::URL Authentication
System > Enterprise Parameters::URL Directories
System > Enterprise Parameters::URL Services
System > Enterprise Parameters::URL Information
System > Enterprise Parameters::Enable All User Search* >> should be set to TRUE
System > Enterprise Parameters::Enable All User Search* >> Set this to a value greater than 0
Restart IIS service. Start>Programs>Administrative Tools>Services, right click on the and select
If IIS fails to restart, please open a cmd prompt window and type:
C:\>iisreset /start
Also, try restarting Tomcat service.
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080093e72.shtml#host
http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00800a6763.shtml