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— A comma (,) inserts a one-second pause between digits. The comma can be used, for

example, where a “9” is dialed to signal a PBX that the call should be processed by

the PSTN. The “9” is followed by a comma to give the PBX time to open a call path

to the PSTN, after which the remaining digits will be played out. An example of this

string is “9,5551212”.

— A period (.) matches any single entered digit from 0 to 9, and is used as a wildcard.

The wildcard can be used to specify a group of numbers that may be accessible via a

single destination router, gateway, PBX, or Cisco CallManager. A pattern of “200.”

allows for ten uniquely addressed devices, while a pattern of “20..” can point to 100

devices. If one site has the numbers 2000 through 2049, and another site has the

numbers 2050 through 2099, then the bracket notation would be more efficient.

— Brackets ([ ]) indicate a range. A range is a sequence of characters that are enclosed

in the brackets. Only single numeric characters from 0 to 9 are allowed in the range.

In the previous example, the bracket notation could be used to specify exactly which

range of numbers is accessible through each dial peer. For example, the first site

pattern would be “20[0 – 4].”, and the second site pattern would be “20[5-9].”. Note

that in both cases, a dot is used in the last digit position to represent any single digit

from 0 to 9. The bracket notation offers much more flexibility in how numbers can

be assigned.

 T: An optional control character indicating that the destination-pattern value is a

variable-length dial string. In cases where callers may be dialing local, national, or

international numbers, the destination pattern must provide for a variable-length dial plan.

If a particular voice gateway has access to the PSTN for local calls and access to a

transatlantic connection for international calls, then calls being routed to that gateway will

have a varying number of dialed digits. A single dial peer with a destination pattern of ".T"

could support the different call types. The interdigit timeout determines when a string of

dialed digits is complete. The router continues to collect digits until there is an interdigit

pause longer than the configured value, which by default is 10 seconds.

When the calling party finishes entering dialed digits, there is a pause equal to the interdigit

timeout value before the router processes the call. The calling party can immediately terminate

the interdigit timeout by entering the pound character (#), which is the default termination

character. Because the default interdigit timer is set to 10 seconds, users may experience a long

call setup delay.

Note Cisco IOS software does not check the validity of the E.164 telephone number. It accepts

any series of digits as a valid number.

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Cisco GRP Manual de usuario Pagina 12