I had an action item to define which version of SOAP we are using in the standard.  At the moment I believe all implementations are utilizing SOAP 1.1 by default.  I say this because I have captured a few SOAP messages in the past and they all contain the following SOAP URL:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

By definition the following name spaces apply to the specific SOAP versions:
SOAP 1.1 : http://schemas.xmlsoap.org/soap/envelope/
SOAP 1.2 : http://www.w3.org/2003/05/soap-envelope

I have used WSDL 1.1 to specify the protocol which typically lines up with SOAP 1.1.  I believe most people's implementation will default to SOAP 1.1 unless specifically told to use SOAP 1.2.  I therefore recommend we specifically declare that NSI CSv2 used the SOAP 1.1 binding.

John

References

W3C - From SOAP/1.1 to SOAP Version 1.2 in 9 points.  http://www.w3.org/2003/06/soap11-soap12.html