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Components +----------------------------+ +----+ | | | | | Appearance Agent | | UA | | | | | +----------------------------+ +----+ ^ ^ |1)SUBSCRIBE ^ ^ 4)NOTIFY INVITE | | | |(Event:reg) | | registration alice@example.com | | | V | | events V | | +--------------------+ +----------+7)Query+--------+ | | | (example.com) | | |<===== | | | | | |3) Store| Location | | Proxy | | | | Registrar |=======>| Service | | | | | | | | |=====> | | | | +--------------------+ +----------+8)Resp +--------+ | | ^ ^ | | | | | | 2) REGISTER (alice) | | | | | | | | | | +----+ +----+ | | | | | | | | | | | | |UA1 | |UA2 | | | | | | | | | | | | | +----+ +----+ | | | | ^ ^ ^ ^ | | | | | | | | | | | +----+ | | | | | | | | +--------------------------------------+ | | +----+-------------------------------------------+ | | 8) INVITE +--------------+ alice@example.com 5-7) SUBSCRIBE and/or PUBLISH (Event:dialog) SIP Registrar/Location Service SIP Forking Proxy Appearance Agent which includes a State Agent for the dialog package SIP User Agents that support this feature |