SIP file directory: The ‘resource’ event package SUBSCRIBE sip:bob@example.com Event: resource 200 OK 200 OK PUBLISH Event: resource XML doc. including a resource description of available resources: files, printers, etc. 200 OK NOTIFY Event: resource XML doc. including a resource description of available resources: files, printers, etc. Now Alice is aware of the list of available files at Bob’s mobile device and laptop 200 OK PUBLISH Event: resource XML doc. including a resource description of available resources: files, printers, etc. ESC |