Microsoft Notification Protocol
Microsoft Notification Protocol - клиент-серверный протокол мгновенного обмена сообщениями, разработанный компанией Microsoft. По-видимому, используется только в публичном сервисе Windows Live. В корпоративных решениях, например, продукте Microsoft Office Communications Server - данный протокол не задействован.
Первое публичное появление ПО, использующего этот протокол, состоялось в 1999 году.
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История
Не смотря на собственническую природу протокола назвать его полностью закрытым невозможно. Первоначально в IETF был представлен документ, содержащий описания протокола (MSN Messenger Service 1.0 Protocol), который получил статус черновика. Но дальнейшего изменения статуса и появления нового RFC не произошло, потому что не соответствовал требованиям рабочей группы IMPP (Instant Messaging and Presence Protocol). Отдельные моменты из этого документы были учтены при разработке IMPP RFC, но не более.
В дальнейшем Microsoft применяла этот протокол исключительно для собственных разработок, не публикуя в открытых источниках информацию об устройстве протокола.
Описание протокола
Неофициальная вики, содержащая описание протокола (англ.).
Устройство протокола
Протокол использует две сущности 'Notification Server' ('NS') и 'Switchboard Servers' ('SBs'). Подключение клиента производится к первой, которая предоставляет информацию о присутствии. После этого возможно подключение ко второй, которая непосредственно осуществляет обмен сообщениями.
Все взаимодействие пользователей осуществляется через сервер и P2P соединения отсутствуют.
В качестве отдельной функции чата между двумя пользователями нет. Сессии связи (последством SBs) могут организовываться между любым количеством пользователей и нет возможности ограничить его искуственно (например, до двух пользователей).
Версии
Изменения в протоколе происходят достаточно часто (до нескольких раз в год). Версии нумеруются просто по порядку (8, 9, 12, 13, 14, 15). Можно встретить такое обозначение 'MSNP8', 'MSNP9', 'MSNP12. При этом публичный сервис периодически повышает свои требования к версии протокола, поддерживаемой клиентом. Например, клиентские программы с поддержкой протокола младше 8 версии не могут подключаться к серверам Microsoft.
По состоянию на осень 2008 года порядковый номер протокола достиг 18 номера.
Клиент
- Официальный клиент Windows Live Messenger.
Также поддержка этого протокола есть в ряде сторонних IM-клиентов. Например, поддержку этого протокола содержит библиотека libpurple и, соответственно, клиенты на ее базе.
Сервер
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Корпоративные
Как сказано выше, корпоративные решения не используют данный протокол и северной части, работающей с ним - нет.
