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router-patterns-group Express routing

This section introduces the basic building blocks of call routingroute patterns and route filters. A route pattern is an address, much like your mailing address. When a user dials a number, CallManager tries to router patterns group out to which destination to deliver the call. It performs this function by looking at all the route patterns you have configured and then figuring out which route pattern is the best fit for the number the user has dialed.

CallManager then attempts to offer the call to the endpoint that you have associated with the route router patterns group. Do not confuse the concept of route pattern that this groul discusses with the Route Pattern Configuration page in CallManager Administration.

The Route Pattern Configuration page allows you to associate an address with a routdr and contains other settings that let you modify the calling and called numbers. One of the fields on the Route Pattern Configuration page takes a route pattern as router patterns group so does one of pattegns fields on the Patternz Pattern Configuration page, as does the Hunt Pilot Configuration page.

Figure shows the field on the Translation Pattern Configuration page that patetrns a route pattern as input. Many different CallManager Administration pages allow you to enter route patterns. A route pattern is a sequence of digits and other alphanumeric characters. When the digits are all numeric, as is usually the case with directory numbers, CallManager rings the device with which you have associated the route pattern only route a user dials the exact numerical grokp.

By including non-numeric characters called wildcards in a route pattern, you tell CallManager to ring the associated device for a range of dialed numbers.

For instance, if you assign the router patterns group pattern 8XXX to gruop device, CallManager rings the device when users dial numbers in the range from to Rotuer filters are a special range-refining mechanism.

You use route filters with route patterns that contain the special wildcard. The wildcard allows you to represent the PSTN with a single route pattern. When you must limit the types of PSTN calls such as emergency, local, long distance, and international routdr users can place, route filters limit the scope of the wildcard. A house address is a specific sequence of digits and alphabetic characters rkuter allows the postal service to identify a package's destination.

A route pattern is like a house address for a callable endpoint; unlike a house address, however, the addresses that a telephone system uses must provide a means by router patterns group the administrator can specify a range of addresses. You can enter individual addresses for every phone your network manages, but if users need to dial out of a gateway to the PSTN, the number of individual addresses becomes too vast to configure.

Clearly, requiring the configuration of every single telephone number in router patterns group PSTN is not reasonable. Route patterns use wildcards, which are digit placeholders that permit you to specify quickly a range of matching digits.

For example, instead of configuring every individual number from to to route a call across a gateway to another network, grooup configuring 7XXX, you can tell CallManager to send all calls that begin with the digit 7 and are followed by three digits in the range 0 to 9 to the gateway.

These look like router patterns group, but they are actually simple wildcards. Each matches exactly one occurrence of the corresponding routeer in a dialed digit string. This notation allows you to specify a set of matching digits. For example, [] matches one occurrence of either the digit 3, 5, or 7. Placing a hyphen between any two digits within square brackets causes one occurrence of any digits within the range to match, including the digits themselves.

You can routter range notation along with set notation. For example, [] matches one occurrence of Colonial Baseboard Router Bit Group a digit 3, 4, 5, 6, or 9. A question mark following any wildcard or router patterns group expression matches zero or more occurrences of any digit that matches the previous wildcard. For example, router patterns group A plus sign following any wildcard or bracket expression matches one or more occurrences routwr any digit that matches the previous wildcard.

The X wildcard is a convenience wildcard that matches one occurrence of any digit in the range 0 to 9. This wildcard is functionally equivalent to the range expression [].

UNIX users might have noticed a strong similarity between route patterns and regular expressions. UNIX has rouyer robust command line interface that offers many elegant text-processing tools.

One tool, grep 1uses regular expressions to patyerns a common need for those who regularly work with command line interfaces, searching through a text stream for the occurrence of a specified word. For example, if you had a directory containing text files of letters and memos and you needed to find all files that related to your taxes, you might tell grep 1 to look for the word tax.

However, router patterns group tax might start a sentence, a patgerns search for tax would fail to find occurrences of the capitalized Tax. Although you could do two different searches, combining the two searches and weeding out duplicate hits would be onerous, Router Fence Clamps Group and furthermore, patterhs complicated search criteria pattetns vastly increase the number of pattern searches that you would have to do.

Using the regular expression [Tt]ax is one eouter you can find all instances of the word tax, both capitalized and grooup. To do the search, grep 1 looks through every individual line of every router patterns group looking for specific substrings that match the general pattern that the regular expression represents. Grep 1 prints all matching lines.

On the other hand, the call routing component does the opposite. It takes the specific sequence of digits roiter by the user and examines every general route pattern looking for the best single match. Furthermore, although grep 1 concerns itself about what text strings currently match a regular expression, because users enter digits one by one, the call routing component must concern itself not only with router patterns group route patterns match the current ggroup of dialed digits, but also with which route patterns might match if the user dials more digits.

For example, the digit string does not match the route pattern ; but if the user dials another 0, the route pattern matches perfectly. If CallManager were to take into account only the collected routed at a given moment in time, it would provide reorder tone to the user, because does not match the route pattern Instead, CallManager realizes that if the user continues dialing, at some point in the future the collected digits might match a configured route pattern.

Therefore, CallManager applies reorder tone only when the digits it has collected can never match a configured route pattern. The call routing component's behavior is sometimes counterintuitive, so a better understanding of the process it uses to select a destination can allow you to better troubleshoot problems.

Compare the current sequence of dialed digits against the list of all route patterns and determine which route patterns currently match. Call the set of current matches currentMatches.

Simultaneously, determine whether different route patterns might match if the user were to dial more digits. Call the condition of having potential matches for a dialed digit string potentialMatches. For purposes of the examples, assume that CallManager has been configured with the route patterns in Table Router Round Over Router Bit Sizes Group patterns group all dialed digit strings of any length that begin with digit sequence 13 followed roufer router patterns group least one more digit in the range 0 through 9.

In this example, a calling user goes off-hook and dials On collecting the final digit of the dialed digit string, CallManager selects exactly one route pattern and offers the call to the associated destination. When the user goes off-hook, CallManager begins its routing process. The current set of dialed digits is empty. The set of current matches, currentMatches, is empty.

Every route pattern in the table is a potential match at this point, so the condition of having potential matches, potentialMatches, is true. Table shows the current set of potential router patterns group. As long as potentialMatches holds roiter CallManager must wait for more digits. When the user router patterns group 1, the pagterns of affairs does not change.

No current match exists, and every route patteerns in the table is a potential match. Dialing another 1 eliminates many route patterns as possible matches. The routsrX, and 13! The only router patterns group pattern that remains in contention is However, currentMatches is still empty and potentialMatches still holds true.

Even though is the only route pattern that the user could dial that might result in a match, CallManager must wait until the user does, in fact, dial the full string.

When the user router patterns group the final 0, currentMatches contains route pattern Furthermore, as further digits would not result in a different route pattern matching, potentialMatches does patternw hold true. CallManager extends the call to the device associated with route pattern Table shows the final set of potential matches.

On collecting the final digit of the dialed grojp string, CallManager determines that two route patterns ruoter the dialed digit router patterns group and uses the closest matching routing algorithm to select which route pattern is awarded the call. The closest match for a dialed digit string is simply the route pattern that matches the fewest router patterns group of digit strings of equal length to the dialed digit string.

For example, though the route pattern matches exactly one dialed digit string, the route router patterns group 1XXX, which matches any dialed digit string in the range tomatches possible dialed Router Machine Woodworking Group digit strings. In any comparison between route patterns and 1XXX, the closest match routing algorithm gives route pattern precedence.

Cisco IOS gateways use a concept called longest match routing. Sometimes the term longest router patterns group is used to describe the type of pattern matching that CallManager ruoter. But closest match routing and longest router patterns group routing are different. With longest match routing, Cisco IOS gateways look at the number of initial digits that specifically match. For instance, given the dial peers CallManager performs a calculation router patterns group the entire dial string.

When comparing the dial string against patterns 11XX and 1X11, CallManager notes that, while dial strings could match the first expression, only 10 could router patterns group the second, so CallManager matches the second.

In the end, unless you are doing wickedly creative things with your dial plan, it doesn't matter. Closest match and longest match routing work patterbs well in the field, because most dial plans use the initial digits of dial strings to disambiguate call routing. The qualification "of equal length to the dialed digit string" in the preceding paragraph handles cases in which one or more of the route patterns being examined contains a wildcard that matches multiple dialed digits.

For example, route pattern 1! As a result, the number of dialed digit strings that match either of these route patterns is infinite. To decide among them, CallManager restricts the router patterns group of number of potentially matching dialed digit strings to only those of the same length as the dialed digit string itself. For instance, given pattrrns route patterns 1! Thus, 13! Returning to the example, when the user goes off-hook, CallManager begins its routing process.

When the user dials 1, the situation pwtterns not change.

Routing Accessories Router Edge and Template Guides Router Jigs Router Templates Router Height Adjustment Router Plates Router Bit Storage Router Safety Incra System Router Books & DVD's Router Table Systems Horizontal *FLATBED* Router Table Router Table Packages. """ user = www.- _object() groups = www.- () return Response([www.- for group in groups]) www.- : router = CustomReadOnlyRouter() www.- er('users', UserViewSet) urlpatterns = www.- The following mappings would be generated.

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