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Co-Existence with SIP PUAs +---------------+ +------------+ | Event State | | Presence |<-- SIP SUBSCRIBE | Compositor +---------+ Agent |--> SIP NOTIFY | | | (PA) | +-------+-------+ +------------+ | | | +---------------+ +--------------^-------------| XCAP server | | | +-------+-------+ | | ^ | SIP Publish | | XCAP Publish | | | +--+--+ +--+--+ +--------+--------------+ | PUA | | PUA | | XCAP presence-publish | | | | | | clients | +-----+ +-----+ +-----------------------+ |