http "get" strips the parameters

Question

This call works from my local server (the same one on which IIS 7 is running):
http://98.254.14.208/IntelliVoice/Service1.asmx/getCompanyInfoByDNISWS?DNIS=<sip:11456@192.168.2.30>

but it does not pass the parameter (or does not seem to pass the parameter) when called from a remote ie client.  This seems to have changed when I upgraded to Windows 7 from Vista but I am not certain of this.  Both Vista and Windows 7 are the Home Premium version.