This chapter contains sections titled:

• PoC Standardization

• IETF Work Relevant to PoC

• Architecture

• Registration

• PoC Server Roles

• PoC Session Types

• Adding Users to a PoC Session

• Group Advertisements

• Session Establishment Types

• Answer Modes

• Right-to-speak Indication Types

• Participant Information

• Barring and Instant Personal Alerts

• The User Plane

• Simultaneous PoC Sessions