Which two enterprise presence domains can federate with Cisco IM and Presence by using SIP? (Choose two.) 

Answer options:

A. AOL
B. Microsoft OCS
C. IBM Sametime
D. Cisco WebEx Connect
E. Google Talk
F. Cisco Unified Presence 8.X Releases

AB

Microsoft Lync and OCS support presence services with sip as well as AOL so to sip is easy to troubleshoot and feasible for signaling thats why cisco federate these with sip.