Hello, Rui. Did you get to solve your problem? I have the same problem here, however I only have a S2 (same OS and kernel as yours) and is not working! 06-04 15:38:59.828 16097 16365 E csf.ecc.sipcc: src/softphonewrapper/CC_SIPCCService.cpp(330)| _SI...

If you are using IAS on Windows 2k3 you can apply the "Request must contain the message authenticator attribute" check box to your switch profile!