ATech Machine LIBRA-02 M Informacje Techniczne Pobierz pdf (Strona 252)

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101

same => n(continue),NoOp()

same => n,SayNumber(${COUNT})

same => n,Set(COUNT=$[${COUNT} + 1])

Now that we’ve incremented COUNT, let’s put the new value back into the database.

Remember that storing a value for an existing key overwrites the previous value:

exten => 678,1,Set(COUNT=${DB(test/count)})

same => n,GotoIf($[${ISNULL(${COUNT})}]?:continue)

same => n,Set(DB(test/count)=1)

same => n,Goto(1)

same => n(continue),NoOp()

same => n,SayNumber(${COUNT})

same => n,Set(COUNT=$[${COUNT} + 1])

same => n,Set(DB(test/count)=${COUNT})

Finally, we’ll loop back to the first priority. This way, the application will continue

counting:

exten => 678,1,Set(COUNT=${DB(test/count)})

same => n,GotoIf($[${ISNULL(${COUNT})}]?:continue)

same => n,Set(DB(test/count)=1)

same => n,Goto(1)

same => n(continue),NoOp()

same => n,SayNumber(${COUNT})

same => n,Set(COUNT=$[${COUNT} + 1]

same => n,Set(DB(test/count)=${COUNT})

same => n,Goto(1)

Go ahead and try this example. Listen to it count for a while, and then hang up. When

you dial this extension again, it should continue counting from where it left off. The

value stored in the database will be persistent, even across a restart of Asterisk.

In the next example, we’ll create dialplan logic around the BLACKLIST() function, which

checks to see if the current caller ID number exists in the blacklist. (The blacklist is

simply a family called blacklist in the AstDB.) If BLACKLIST() finds the number in the

blacklist, it returns the value 1; otherwise, it will return 0. We can use these values in

combination with a GotoIf() to control whether the call will execute the Dial()

application:

exten => 124,1,GotoIf($[${BLACKLIST()]?blocked,1)

same => n,Dial(${JOHN})

exten => blocked,1,Playback(privacy-you-are-blacklisted)

same => n,Playback(vm-goodbye)

same => n,Hangup()

To add a number to the blacklist, run the database put blacklist <number> 1 command

from the Asterisk command-line interface.

216 | Chapter 10: Deeper into the Dialplan

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