Event Filtering

1
Event Filtering

• Hisham Khartabil
• SIMPLE WG
• Interim Meeting, Boston
• 24th May, 2004
• hisham.khartabil_at_nokia.com

2
Functional Description Issue (1)

• A SUBSCRIBE request is allowed to carry multiple
  filters. Need to add text that disallows more
  than 1 filter per resource to be specified (eg
  If the subscribe is for a list)
• SUBSCRIBE sipmyfirends_at_domain.com SIP/2.0
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"8439" uri"sipsarah_at_domai
  n.com"gt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• ltfilter id"999" uri"sipsarah_at_domain
  .com"gt
• ltwhatgt
• ltinclude type"namespace"gturnietfpar
  amsxmlnspidflt/includegt
• ltexcludegt//pidftuple/pidfnotelt/exclu
  degt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

3
Functional Description Issue (2)

• Current text If the URI indicated by the filter
  is for one resource who's URI is NOT one of the
  URIs that result from a lookup, by the RLS, on
  the Request-URI, the filter is propagated to
  all the fanned out subscriptions.
• List1 (list1_at_example1.com) on RLS1 has
•      bob_at_example1.com
•      list2_at_example2.com 
• List2 on RLS2 has
•      alice_at_example2.com

4
Functional Description Issue (2)

• List1 (list1_at_example1.com) on RLS1 has
•      bob_at_example1.com
•      list2_at_example2.com 
• List2 on RLS2 has
•      alice_at_example2.com

• RLS1 receives the following SUBSCRIBE request
• SUBSCRIBE sipList1_at_example1.com SIP/2.0
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"999" uri"sipsarah_at_example1.co
  m"gt
• ltwhatgt
• ltinclude type"namespace"gturnietfpar
  amsxmlnspidflt/includegt
• ltexcludegt//pidftuple/pidfnotelt/exclu
  degt
• lt/whatgt
• lt/filtergt
• ltfilter id"8439" uri"sipalice_at_examp
  le2.com"gt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

5
Functional Description Issue (2)

• Currently, this is propagated to RLS2
• SUBSCRIBE sipList2_at_example2.com SIP/2.0
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"999" uri"sipsarah_at_example1.co
  m"gt
• ltwhatgt
• ltinclude type"namespace"gturnietfpar
  amsxmlnspidflt/includegt
• ltexcludegt//pidftuple/pidfnotelt/exclu
  degt
• lt/whatgt
• lt/filtergt
• ltfilter id"8439" uri"sipalice_at_examp
  le2.com"gt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

6
Functional Description Issue (2)

• Suggestion if a filter is destined to a resource
  that is part of list that is outside the
  administrative domain of an RLS, then that filter
  is propagated. The rest are consumed.
• SUBSCRIBE sipList2_at_example2.com SIP/2.0
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"8439" uri"sipalice_at_examp
  le2.com"gt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

7
Functional Description Issue (2)

• List1 (list1_at_example1.com) on RLS1 has
•      bob_at_example1.com
•      list2_at_example2.com 
• List2 on RLS2 has
•      alice_at_example2.com

• What if the list last was
• List1 (list1_at_example1.com) on RLS1 has
•      bob_at_example1.com
•      list2_at_example2.com 
• List2 on RLS2 has
•      alice_at_example2.com
• sarah_at_example1.com
• Proposal 1 Only propagate filters that are for
  resources not under an RLSs administrative
  domain. The rest are consumed
• Proposal 2 Propagate all filters for resources
  that the RLS did not find an entry for in a list,
  including resources under its own administrative
  domain

8
Functional Description Issue (3)

• Need to clarify that a filter for an individual
  resource overrides a domain filter.
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"8439" uri"sipexample1.co
  m"gt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• ltfilter id"999" uri"sipbob_at_example1
  .com"gt
• ltwhatgt
• ltinclude type"namespace"gturnietfpar
  amsxmlnspidflt/includegt
• ltexcludegt//pidftuple/pidfnotelt/exclu
  degt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

9
Filter Format Issues (1)

• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id8439" uri"sipalice_at_example1.comgt
• ltwhatgt
• ltincludegt//pidftuple/pidfnotelt/incl
  udegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt
• When removing a filter, a subscriber must
  explicitly do so by specifying the filter ID
  along with the remove attribute set to True.
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filtergt
• ltfilter id"8439" removeTrue/gt
• lt/filter-setgt

10
Filter Format Issues (1)

• Problem How does a subscriber replace a filter?
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"8439" uri"sipalice_at_examp
  le1.com removeTrue/gt
• ltfilter id"8440" uri"sipalice_at_examp
  le1.comgt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt

11
Filter Format Issues (1)

• Proposal 1 disallow inclusion of uri attribute
  when removing a filter
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id"8439" removeTrue/gt
• ltfilter id"8440" uri"sipalice_at_examp
  le1.comgt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt
• lt/filtergt
• lt/filter-setgt
• Proposal 2 Allow a filter to be replaced using
  the same filter id
• lt?xml version"1.0" encoding"UTF-8"?gt
• ltfilter-set xmlns"urnietfparamsxmlnssi
  mple-filter"
• xmlnspidf"urnietfpara
  msxmlnspidf"gt
• ltfilter id8439" uri"sipalice_at_example1.comgt
• ltwhatgt
• ltincludegt//pidftuple/pidfstatus/pid
  fbasiclt/includegt
• lt/whatgt