CODEWITHSUNDEEP
asterisktelephony
Sriram
Sriram

Reputation: 10578

Function that returns a value in extensions.conf - asterisk

I want to do the following in my extensions.conf in asterisk:

  1. Read in a number entered by a user. - easy
  2. Feed that number into a script which returns a wav file.
  3. This wav file is then played.

I know the system command, but have not been able to figure out a way for it to return a value.

Any help is most welcome,
Thanks,
Sriram.

Upvotes: 0

Views: 2243

Answers (2)

Sriram
Sriram

Reputation: 10578

One can have the program/script write the value to a file and then use the functions within asterisk such as ReadFile to get the value. This can be done like so:

Within the script:
echo -n ${value} > ${fileName}

From within asterisk:
exten => 0,n,ReadFile(ValueReadFromFile=${fileName},${MAX_FILE_CHAR})

where: ${MAX_FILE_CHAR} is the max. characters that need to be read from the file ${fileName}. The value you want read will be stored in ValueReadFromFile.

Upvotes: 0

Michał Niklas
Michał Niklas

Reputation: 54342

For such things I use Asterisk AGI. Idea is similar to CGI scripts for Web servers. You can use various languages, but I use Python with pyst: Python for Asterisk library. Such AGI script/program can read or set channel variable and this way communicate with Asterisk dialplan.

Example of such code with pyst agilib:

wav_to_play = 'other.wav'
user_nr = agilib.get_variable('user_entered_number')
if not user_nr:
    wav_to_play = 'nothing.wav'
elif user_nr.endswith('0'):
    wav_to_play = 'zero.wav'
# ...
agilib.set_variable('wav_selected', wav_to_play)

After saving such code in wav_selector.agi (you must add normal Python header, libs etc) you can use it in dialplan like:

exten => s,n,Set(user_entered_number=5)
exten => s,n,AGI(wav_selector.agi)
exten => s,n,Background((${wav_selected})

Upvotes: 1

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