+----+ +---------------------->|IDLE|<----------------------------+ | +-+--+ | | | | | | start | | | channel | | v | | channel error / +--------+ | | session ends | CHANNEL| | +----------------------+ SETUP | | | +--+-----+ | | | | | | channel | | | established | | channel error / v OPTIONS phase | | session ends +-------+ failure | +-----------------------+OPTIONS+--------------------------+ | +-+-----+ | | | | OPTIONS phase | | success | v | channel error / +---------+ | session ends | ACTIVE | +----------------------+ | | +----+ +------------------+ | | MP | | send/receive | | +----+ | CLUE messages | | |<-----------------+ | +----+ | | | MC | | | +----+ | | | +---------+