Redirect the subscriber to the "Telemarketing" queue.

Select the required queue in the "Queue" field.

Set a timer to play an offer to request a call back (Timer1):

• press the "Add Timer" button;

• in the "Interval (sec)" field, enter the time (in seconds). After this time, the record selected using the “Playback” component will be played;

• enter the number of playback repetitions, in the "Tries" field.

Hangup

(branch 1)

Playback

(branch 2)

Play a file with a suggestion to press "1" to order a  call back.

This requires:

• select "media" in the "File type" field;
• select the file that contains the offer to order a back call by pressing "1" in the "Media" field that appears, 
• switch "Get digits" to the active position;
•  value - 1 in the fields "Min" and "Max";
• Set the name of the variable in which the value selected by the subscriber will be written  in the "Set result to variable" field . In this example, getIVR

If

(branch 2)

Check if the subscriber pressed the number 1.

This requires:

• enter the condition in the "Expression" field:

${getIVR} == '1'

Hangup

(branch 2)

End the call

Check if the subscriber pressed the number 1.

This requires:

• enter the condition in the "Expression" field:

${getIVR} == '1'

Search for information on the subscriber.

This requires:

• Enter the subscriber's number in the "Destination" field. In the example, it is taken from the variable - ${caller_id_number} ;
• select the queue in the "Queues" field in which the scan will be performed;
• enter in the "Set" element:

 member_exists - id

Check if this subscriber has a callback issued earlier.

This requires:

• enter the condition in the "Expression" field:

!${member_exists}

Create a call back.

This requires:

• select the queue from which the call back  will be made in the "Queue" field,
• in the "Hold (sec)" field, enter the number of seconds after which you want to call back;
•  enter the subscriber's number in the "Destination" field. In the example it is passed to the "${caller_id_number}" variable
• select the type of communication in the field "Communication type" . In the example, "Mobile" is selected;
• enter the next data in the "Set variables" element to display to the operator information that the subscriber has left a request for a call back :

Source - Call Me Back