I recently upgraded all my CCMs to the 8.3.3 loads. Starting with that upgrade, I'm no longer able to access any http://<ip-phone-address/CGI/ urls (the main status page still comes up, but even the links there just return a 400 response).
I've read through the 8.3.2_IP_Phone_Services_Enhancements documentation but can't find anything with regards to this behavior.
Did anybody else catch what has been changed (I suppose there have been some changes in response to the recently published hacklu article on how you can sort of hijack an IP phone by going via it's web interface)?
I also noted something in the meantime: if I do the push via http post form in firefox instead of IE, it works like a charm so I guess I was premature. I also have trouble with IE pushing to older phone models so I don't know who to blame but at least it still works from within my apps (xsi via jtapi) and the test mechanism via another browser.
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