Sumit Garg wrote:
Unsolicited NOTIFYs are widely used for Voicemail and are allowed in RFC3265
Um.... no. Please refer to the following excerpt from the section you quoted.
Designers of such mechanisms are also warned to make a distinction between sending a NOTIFY message to a subscriber who is aware of the subscription, and sending a NOTIFY message to an unsuspecting node. The latter behavior is invalid, and MUST receive a "481 Subscription does not exist" response (unless some other 400- or 500-class error code is more applicable), as described in section 3.2.4. In other words, knowledge of a subscription must exist in both the subscriber and the notifier to be valid, even if installed via a non-SUBSCRIBE mechanism.
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