Route Filters

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Route Filters
Prof. Yousif _at_ Valencia community College
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Route Filters-Defined

• Route filters are the mechanism by which you can
  cause CM to add only a subset of a route pattern
  for a given numbering plan.
• Example Using route filters, you can cause an _at_
  pattern to match only the national emergency
  number.
• Route filter work by allowing CM to add only the
  subset of a numbering plan whose tags fulfill the
  constraints that operators impose

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Tags

• Tags are named substrings of individual route
  patterns for a given national numbering plan.
• For instance 1 2-9xx2-9xx xxxx exists in
  the North American Numbering plan. It is
  composed of four sections. The first section, 1,
  denotes the call as a toll call. The second
  section matches an area code. The office code
  and the subscriber code follow.

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Tags in the North American Numbering Plan
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Operators

• Operators are the functions that determine
  whether a given route pattern passes the tests
  you specify.
• Example lttaggt EXISTS operator, whose test is
  passed if the route pattern under inspection
  contains the specified tag.
• Example lttaggt DOES-NOT-EXIST, whose test is
  passed if the route pattern under inspection dose
  not contain the specified tag.

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Value of Route Filters

• Configuring route filters (tags and operators),
  you can do the following
• Block international calls
• Route just local numbers
• Route just toll-free numbers
• Block 900 numbers
• Block long-distance calls

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Example 1
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Example 2
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Example 3
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Example

• Dialed Digits Pattern Pattern Matches
  Filter Final Match
• 912485559093 912485559093 Area Code
  912485559093
• 91900550000 9._at_ 91900550000 248
• 92485559090 92485559090
• 95551212 95551212

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Calling Search Spaces and Partitions

• Calling search spaces and partitions allow you to
  configure individualized call routing, because
  they restrict the route patterns that CM can
  access on behalf of a calling user.
• When seeking a match for calling users dialed
  number, CM restricts its search to only those
  route patterns that reside in the partitions that
  are listed in the calling users calling search
  space.

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Example
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Example--Explained

• The directory in which Dave lists his number is
  equivalent to the partition in which you list a
  route pattern, while the list of directories that
  Rita looks through to find Dave's number is
  equivalent to the calling search space you assign
  to calling devices
• Using calling search spaces and partitions allows
  you to give each device in your network a
  different picture of the routing landscape.
• Partitions divide the ser of all route patterns
  into subsets of destinations
• A partition is simply a name you choose to
  identify a subset.
• For example Partitions ABC is created to
  contain the directory number for all the devices
  in company ABC

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Calling Search Space and Partition Operation

• A partition is an attribute of an address. It
  belongs to Called Entities it has no bearing on
  who a device can call
• The list of partitions in a devices calling
  search space is the sole dictator of who it can
  call
• Partitions merely divide the global address space
  into meaningful subsets
• A calling search space is nothing more than an
  ordered list of partitions
• Calling search spaces implicitly include the null
  partition as the last partition in the list
• Calling search spaces belong to calling entities
• Devices to which you do not assign a partition
  belong to the None or Null partition

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Example
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Example