--> Dial plans on Cisco routers are manually defined using dial peers.
--> Dial peers are similar to static routes; they define where calls originate and terminate and what path the calls take through the network.
--> configuring dial peers without using wildcards would be extremely complex.
--> it is possible to configure an outgoing or incoming dial peer that matches a range of destinations with the help of wildcards.
--> To match a single digit we use the wildcard digit “.”( Ex: 6… ----> extension 6000 to 6999).
--> To match a range of numbers we use the wildcard digit “square brackets”( Example1: 5[1-9].. --> extension 5100 to 5199) & ( Example2: [14-8].... --> extension 10000 to 18888 & 4000 to 48888).
--> We can also “not” to match a range or a digit by adding a “^” inside the range ( Ex: [^7]... ----> extension 1000 to 6999 & 8000 to 9999).
--> In the above example we can easily match a pattern that contains the fixed number of digits.
--> Fixed-length dialing plans, in which all the dial-peer destination patterns have a fixed length, are sufficient for most voice networks because the telephone number strings are of known lengths.
--> Some voice networks, however, require variable-length dial plans, particularly for international calls, which use telephone numbers of different lengths.
--> Variable-Length Dial Patterns are used when we are calling to an international destination, as it is not possible to know length of the numbers used in other countries.
--> We need a wildcard to match a variable number of digits. For that purpose, we can use wildcard digit “T”, which indicates the pattern has a variable length (between 0 and 32 digits).
--> If we create pattern 91T, we match all patterns that start with 91 followed by a variable number of digits.
--> The pattern 91T will match 919954710200 (12 digits) but also 9134455556666 (13 digits).
--> To make sure no more digits are coming, a voice gateway will wait a couple of seconds before routing the call. This delay is called interdigit timeout.
--> On a Cisco gateway this is 10 seconds by default. You can change the interdigit timeout by using the timeouts inter-digit voice-port command.
--> if you enter the “#” key (terminating digit) after typing the number, the voice gateway will recognize this digit and start routing the call directly, without waiting for any more digits.
--> If you want to disable variable-length matching then we can use " $ " Wildcard digit.
Md.Kareemoddin
CCIE # 54759
Ref: Cisco.com
--> Dial peers are similar to static routes; they define where calls originate and terminate and what path the calls take through the network.
--> configuring dial peers without using wildcards would be extremely complex.
--> it is possible to configure an outgoing or incoming dial peer that matches a range of destinations with the help of wildcards.
--> To match a single digit we use the wildcard digit “.”( Ex: 6… ----> extension 6000 to 6999).
--> To match a range of numbers we use the wildcard digit “square brackets”( Example1: 5[1-9].. --> extension 5100 to 5199) & ( Example2: [14-8].... --> extension 10000 to 18888 & 4000 to 48888).
--> We can also “not” to match a range or a digit by adding a “^” inside the range ( Ex: [^7]... ----> extension 1000 to 6999 & 8000 to 9999).
--> In the above example we can easily match a pattern that contains the fixed number of digits.
--> Fixed-length dialing plans, in which all the dial-peer destination patterns have a fixed length, are sufficient for most voice networks because the telephone number strings are of known lengths.
--> Some voice networks, however, require variable-length dial plans, particularly for international calls, which use telephone numbers of different lengths.
--> Variable-Length Dial Patterns are used when we are calling to an international destination, as it is not possible to know length of the numbers used in other countries.
--> We need a wildcard to match a variable number of digits. For that purpose, we can use wildcard digit “T”, which indicates the pattern has a variable length (between 0 and 32 digits).
--> If we create pattern 91T, we match all patterns that start with 91 followed by a variable number of digits.
--> The pattern 91T will match 919954710200 (12 digits) but also 9134455556666 (13 digits).
--> To make sure no more digits are coming, a voice gateway will wait a couple of seconds before routing the call. This delay is called interdigit timeout.
--> On a Cisco gateway this is 10 seconds by default. You can change the interdigit timeout by using the timeouts inter-digit voice-port command.
--> if you enter the “#” key (terminating digit) after typing the number, the voice gateway will recognize this digit and start routing the call directly, without waiting for any more digits.
--> If you want to disable variable-length matching then we can use " $ " Wildcard digit.
Md.Kareemoddin
CCIE # 54759
Ref: Cisco.com
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