| 摘要 |
Subscribing a method and device based on SIP can realize a permanent subscribe and a temporary subscribe, and subscribe the time for transmitting notification. A mechanism of permanent subscribe and temporary subscribe is introduced in the invention. When receiving a SUBSCRIBE message, the notifier sets a permanent subscribe label or a temporary subscribe label for the subscriber according to the label carried by the message or the traffic feature which the subscribed event is correspond to; if a permanent subscribe label, the notifier doesn't stop transmitting NOTIFY message until the subscription is cancelled by the subscriber or the system; if a temporary subscribe label, the notifier doesn't transmit NOTIFY message when the subscription is complete. The subscriber can enable the SUBSCRIBE message transmitted to the notifier carrying the parameter indicating the time when the subscription is valid or the parameter indicating the time when the notify is transmitted, the notifier analyzes the message, and transmits NOTIFY message to the subscriber after the time when the subscription is valid and/or accrording to the time when the notify should be transmitted.
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