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A presence server is a server that sometimes acts as a presence agent and supplies presence information and ot her times acts as a proxy. forwarding SUBSCRIBE requests to another presence agent. Also a presence agent first authenticates a subscription request. If the authentication passes, it establishes a dialog and sends the notifications over that dialog. The subscription can be refreshed by receiving new SUBSCRIBE requests.
Posted by HamidAliKhan
1. A presence agent is a SIP device that is capable of receiving subscription requests and generating state notifications as defined by the SIP Events specification.
2. A presence agent can collect presence information from a number of devices. Presence information cancome from a SIP device registering, a SIP device publishing presence information, or from many other non-SIP sources.
3. A presence server is a server that sometimes acts as a presence agent and supplies presence information and ot her times acts as a proxy. forwarding SUBSCRIBE requests to another presence agent.
4. A presence agent first authenticates a subscription request. If the authentication passes, it establishes a dialog and sends the notifications over that dialog. The subscription can be refreshed by receiving new SUBSCRIBE requests.
Posted by dave
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