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CUCM uses translation patterns to manipulate digits before routing a call. The translation
pattern can also be used to block certain patterns. Translation patterns are useful to manipulate
the caller ID of incoming PSTN calls to allow the users to quickly return phone calls
using the redial and missed-calls functionality. The caller ID from the PSTN may include
only 10 digits while the system requires 11 digits prefixed with an access code of 9 to properly
route outgoing calls. The translation pattern can prefix a 9 and a 1 to all incoming
PSTN calls.
Digit manipulation and translation patterns are used frequently in cross-geographical
distributed systems where, for instance, the office codes are not the same at all locations. In
these situations, a uniform dialing plan can be created and translation patterns applied to
accommodate the unique office codes at each location. Additional examples where
translation patterns can be used are as follows:
■ Security desks and operator desks (abbreviated dialing)
■ Hotlines with a need for private line automatic ringdown (PLAR) functionality
(security phones in elevators or on a college campus)
■ Extension mapping from a public to private network
Translation patterns use route-pattern style matching and transformation-mask digit
manipulations. The resulting pattern is then re-analyzed by the system. The new pattern
may match another translation pattern where digit transformation can occur once again.
Eventually, the call is routed or blocked. To prevent call-routing loops, CUCM passes digits
through translation patterns for only ten iterations.
Figure 12-11 illustrates the operation of a translation pattern. A translation pattern matches
the dialed digits in a similar manner to the matching of a route pattern. The primary difference
between route patterns and translation patterns is that translation patterns do not have
a final call-routing destination (route list, gateway, or trunk). Translation patterns exist only
to manipulate digits.
294 Chapter 12: Digit Manipulation
Figure 12-11 Translation Patterns
To configure a translation pattern, navigate to Call Routing > Translation Pattern, as
shown in Figure 12-12. The translation pattern identifies the dialed digit string to match and
the calling- or called-party transformation settings that should be applied.
If the Block This Pattern radio button is selected, a cause code must be selected. Choose a
value from the drop-down box:
■ No Error
■ Unallocated Number
■ Call Rejected
■ Number Changed
■ Invalid Number Format
■ Precedence Level Exceeded
The transformation settings are not applicable if the Block This Pattern radio button is
selected.
If the translation pattern contains an @ sign, a numbering plan and route filter can be
selected to match certain number patterns of the selected numbering plan.
Digits
Translation
Pattern
Find Best Match
Apply Calling- and Called-
Party Transformations
Pattern Type?
Route Pattern
Extend Call to Destination
Digits
Translation Patterns 295
Translation patterns are processed as urgent priority by default, and the Urgent Priority
check box cannot be removed from a translation pattern. An overlapping dial plan involving
a translation pattern could result in call-routing issues.
Figure 12-12 Translation Pattern Configuration
When the direct inward dialing (DID) range from the central office (CO) does not match
the internal DN range, a translation pattern can be used to map the PSTN number to the
internal DNs.
Figure 12-13 shows a scenario in which a company has a PSTN DID range of 408 555-
1XXX, whereas the internal four-digit extensions begin with 4XXX. When the company
receives an incoming call, the company uses a translation pattern that matches the assigned
PSTN DID range (408 555-1XXX). The called-party transformation mask of 4XXX is
Route Option
Pattern
Transformation Settings
296 Chapter 12: Digit Manipulation
applied against the translation pattern of 408 555-1XXX, resulting in a 4XXX dialed
number. After CUCM applies the transformation mask, it performs a new call-routing
lookup for the translated four-digit number, finds the DN in its call-routing table, and routes
the call to the corresponding IP phone.
Figure 12-13 Translation Pattern Example
An additional translation pattern of XXXX with a called-party transformation mask of
4111 can be used to route calls of unidentified extensions to the company operator. Assume
that the DN of 4333 no longer exists in the system because that user (Dennis) won the
lottery for $10 million and decided that he was going to play his guitar all day long instead
of working. When a call comes in from the PSTN to 408 555-1333, the call is translated
to 4333. Because 4333 no longer exists, it matches the generic XXXX translation pattern,
and the call is routed to the company operator at extension 4111. Josephine (the company
operator) instructs the outside caller that Dennis can be reached on his cell phone because
he is home playing Metallica on his guitar.