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Copyright (c) 2011 IETF Trust and the persons identified as the document authors. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( in effect on the date of publication of this document. If the presence subscription request cannot be locally delivered or remotely routed (e.g., because the request is malformed, the local contact does not exist, the remote server does not exist, an attempt to contact the remote server times out, or any other error is determined or experienced by the user's server), then the user's server MUST return an appropriate error stanza to the user. After locally delivering or remotely routing the presence subscription request, the user's server MUST then send a roster push to all of the user's interested resources, containing the potential contact with a subscription state of "none" and with notation that the subscription is pending (via an 'ask' attribute whose value is "subscribe").Please review these documents carefully, as they describe your rights and restrictions with respect to this document. If a remote contact does not approve or deny the subscription request within some configurable amount of time, the user's server SHOULD resend the subscription request to the contact based on an implementation-specific algorithm (e.g., whenever a new resource becomes available for the user, or after a certain amount of time has elapsed); this helps to recover from transient, silent errors that might have occurred when the original subscription request was routed to the remote domain. In order to protect the privacy of XMPP users, presence information is disclosed only to other entities that a user has approved.

When roster versioning is enabled, the server MUST include the updated roster version with each roster push. (This model is different from that used for presence subscriptions in the Session Initiation Protocol (SIP), as defined in [SIP‑PRES] Implementation Note: When a server processes or generates an outbound presence stanza of type "subscribe", "subscribed", "unsubscribe", or "unsubscribed", the server MUST stamp the outgoing presence stanza with the bare JID Subscription states are reflected in the rosters of both the user and the contact. In XMPP, a subscription lasts across presence sessions; indeed, it lasts until the contact unsubscribes or the user cancels the previously granted subscription. Complete details regarding subscription states can be found under Appendix A A "subscription request" is a request from a user for authorization to permanently subscribe to a contact's presence information; syntactically it is a presence stanza whose 'type' attribute has a value of "subscribe". This section does not cover every possible case related to presence subscriptions, and mainly narrates the protocol flows for bootstrapping a mutual subscription between a user and a contact.

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