Pega 7.1.9 and 7.2.x which version of EMC Documentum support .
The version of Documentum supported in both the versions is the same, i.e., we support any CMIS-compliant version of Documentum. We've used Documentum v7.1 for our tests.
Which activity is responsible to connect from pega to EMC Documentum .
To connect to any CMIS-compliant ECM repository and not just Documentum, one would typically use Connect-CMIS activity method which internally uses Rule-Connect-CMIS.Invoke and Rule-Connect-CMIS.InvokeCMISConnector activities.
Is any specific vender specific jar or utility required to connect ?
You don't need a vendor specific jar on Pega connector side to connect to a CMIS-compliant ECM repository. But you may need additional installation steps on the ECM side to CMIS-enable it. As I mentioned, for Documentum, you will have to deploy emc-cmis.war. This contains all CMIS APIs that Documentum supports.
Is connect-CMIS support multiple SOAP url ?
I'm sorry, I don't get this question. Could you please elaborate.