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CPCP Issue 1: External Lists (Cont.)
Issue 2: How to represent them
Proposal 1: Use XCAP URI
The focus uses the XCAP list URI to fetch the URIs for the members of the external list. It then sends INVITE (in SIP terms) to the members of that external list

http://xcap.example1.com/services/presence-lists/users/bob/list1.xml

Proposal 2:
The focus sends an INVITE to the list just like any other resource. It may result in a cascaded conference

sip:list@operator.com

PPT Version