Hi,
Number Expansion
In most corporate environments, the telephone network is configured so that you can reach a destination by dialing only a portion (an extension number) of the full E.164 telephone number. You can define an extension number as the destination pattern for a dial peer. The router can be configured to recognize the extension number and expand it into its full E.164 dialed number when the num-exp global configuration command is used with the destination-pattern dial-peer voice configuration command.
Number expansion is a globally applied rule that enables you to define a set of digits for the router to prepend to the beginning of a dialed string before passing it to the remote telephony device. Automatically prepending digits in the dial peer configuration reduces the number of digits that a user must dial to reach a remote location. Number expansion is similar to using a prefix, except that number expansion is applied globally to all dial peers.
Using a simple telephony-based example, suppose that user A works in a company where employees extensions are reached by dialing the last four digits of the full E.164 telephone number. The E.164 telephone number is 555-2123; user A's extension number is 2123. Suppose that every employee on user A's floor has a telephone number that begins with the same first four digits: 5552. You could define each dial peer's destination pattern using each extension number, and then use number expansion to prepend the first four digits onto the extension. In this example, the router could be configured as follows:
Number expansion can also be used to replace a dialed number with another number, as in the case of call forwarding. Suppose that for some reason, user A needs to have all of his telephone calls forwarded to another number, 555-6611. In this example, you would configure the router as follows:
destination pattern 2123
Translation Rules
Digit translation rules are used to manipulate the calling number (ANI)
or called number (DNIS) digits for a voice call, or to change the
numbering type of a call. Translation rules are used to convert a
telephone number into a different number before the call is matched to
an inbound dial peer or before the call is forwarded by the outbound
dial peer. For example, within your company you may dial a 5-digit
extension to reach an employee at another site. If the call is routed
through the PSTN to reach the other site, the originating gateway must
use translation rules to convert the 5-digit extension into the 10-digit
format that is recognized by the central office switch.
Translation rules are defined by using the translation-rule
command. After you define a set of translation rules, you can apply the
rules to all inbound VoIP calls, to all inbound calls that terminate at
a specific voice port, and to individual inbound or outbound call legs
according to the dial peer.
The following example shows a dial peer that is configured to use
translation-rule set 1, which contains ten translation rules. The first
rule defined is rule 0, in which 910 is the pattern that must be matched
and replaced, and 0 is the pattern that is substituted for 910.
rule 0 ^910 0
rule 1 ^911 1
rule 2 ^912 2
rule 3 ^913 3
rule 4 ^914 4
rule 5 ^915 5
For AIM_CUE and NM-CUE have a look here and see the differneces
http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns477/ns296/data_sheet2_c78_390196.html
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