are there web services attributes that can be used to specify dynamically the endpoint location and information?

there are attributes that can be used to override dynamically values for end point in the Integrator Web Services connector.

The attributes are:
wsRequestTimeout: defines SOAP request timeout in seconds (defaults to 60)
wsTargetEndPointURL: overrides the target endpoint URL defined in the Web Service Channel
wsHttpProtocolVersion: accept "1.0" and "1.1"
wsSoapAction: overrides the SOAP action originally extracted from the WSDL
wsMtomThreshold: defines (in Kb) the size above which XML binary elements are optimized (defaults to 2048)
wsConsumerSecurityIdentity: overrides the consumer identity defined in the Web Service Channel