Hi Ronnie,
This is not possible. Wccp is the protocol used for traffic redirection, to discover peers Waas uses autodiscovery , this happens by setting the tcp options to 0x21 in the tcp header of the connection.
Riverbed uses a similar tcp options and use different value , this is hardcoded onto the software to use this. This is the primary reason they cannot talk to each other.
Regards
Abijith Sharma V S
Cisco PDI Helpdesk
www.cisco.com/go/pdihelpdesk