Evaluating IBM Watson Text to Speech API with Asterisk PBX. Using a Bash script to create and format the recording. Script uses curl and avconv commands. This is running on Ubuntu 14.04 with Asterisk 11.7.0.
Bash script /usr/share/asterisk/agi-bin/tts_ibm.sh for Asterisk Gateway Interface (AGI)
#!/bin/bash
#
# Use IBM Watson text to speech service for Asterisk.
#
text=""
regex="200 result=1 \((.*)\)"
checkresults() {
while read line
do
logger "$0 $line"
case ${line:0:4} in
"200 " ) echo $line >&2
if [[ $line =~ $regex ]]
then
text="${BASH_REMATCH[1]}"
fi
return;;
"510 " ) echo $line >&2
return;;
"520 " ) echo $line >&2
return;;
* ) echo $line >&2;;
esac
done
}
echo "GET VARIABLE text0"
checkresults
textHash="$(/bin/echo $text | md5sum | awk '{print $1}')"
originalFile="/tmp/$textHash"
finalFile="/tmp/final$textHash.wav"
logger "$0 Hash: $textHash original: $originalFile file: $finalFile"
if [ -f $finalFile ]
then
logger "$0 File $originalFile already exists. Not contacting IBM."
else
logger "$0 Creating file $originalFile. Contacting IBM."
/usr/bin/curl -s -X POST -u USERNAME:PASSWORD \
--header "Content-Type: application/json" \
--header "Accept: audio/wav" \
--data "{\"text\":\"$text\"}" \
--output "$originalFile" \
"https://stream.watsonplatform.net/text-to-speech/api/v1/synthesize"
/usr/bin/avconv -loglevel quiet -y -i $originalFile -ar 8000 -ac 1 -ab 64 $finalFile
fi
fileWithoutExtension=${finalFile%.*}
logger "$0 Stream file $fileWithoutExtension"
echo "STREAM FILE $fileWithoutExtension \"\""
checkresults
exit 0;
Dial plan snippet /etc/asterisk/extensions.conf
[PremiseVisitSurvey]
exten => s,1(StartPremiseVisitSurvey),Wait(0.3)
same => n,Set(text0=This is ABC Company with a five question survey about your recent service visit. After each question, press 1 for yes, or press 2 for no.)
same => n,Set(randomNumber=${RAND()})
same => n,agi(tts_ibm.sh)
same => n,Set(text0=Did your recent ABC Company service visit meet your satisfaction?)
same => n,agi(tts_ibm.sh)
same => n,Playback(beep)
same => n,Read(response,,1)
same => n,System(/opt/scripts/postIvrResponse.sh ${phoneNumber} ${CONTEXT}_1_${randomNumber} ${response} ${accountNumber} ${orderNumber})
same => n,Set(text0=Were you satisfied with the timeliness of the service?)
same => n,agi(tts_ibm.sh)
same => n,Playback(beep)
same => n,Read(response,,1)
same => n,System(/opt/scripts/postIvrResponse.sh ${phoneNumber} ${CONTEXT}_2_${randomNumber} ${response} ${accountNumber} ${orderNumber})
same => n,Set(text0=Were you satisfied with the quality of the service?)
same => n,agi(tts_ibm.sh)
same => n,Playback(beep)
same => n,Read(response,,1)
same => n,System(/opt/scripts/postIvrResponse.sh ${phoneNumber} ${CONTEXT}_3_${randomNumber} ${response} ${accountNumber} ${orderNumber})
same => n,Set(text0=Was the ABC Company technician knowledgeable and professional?)
same => n,agi(tts_ibm.sh)
same => n,Playback(beep)
same => n,Read(response,,1)
same => n,System(/opt/scripts/postIvrResponse.sh ${phoneNumber} ${CONTEXT}_4_${randomNumber} ${response} ${accountNumber} ${orderNumber})
same => n,Set(text0=Would you like a follow-up call to discuss your responses to this survey?)
same => n,agi(tts_ibm.sh)
same => n,Playback(beep)
same => n,Read(response,,1)
same => n,System(/opt/scripts/postIvrResponse.sh ${phoneNumber} ${CONTEXT}_5_${randomNumber} ${response} ${accountNumber} ${orderNumber})
same => n,Set(text0=Thank you. Good bye.)
same => n,agi(tts_ibm.sh)
same => n,hangup()
Call file /var/spool/asterisk/outgoing/premise_visit_survey_123456.call
CallerID: IVR <8431234567> Channel: SIP/8431234567@abccompany Context: PremiseVisitSurvey Extension: s Archive: Yes MaxRetries: 0 SetVar: phoneNumber=8431234567 SetVar: accountNumber=123456789 SetVar: name=John Doe SetVar: recordingName=premise_visit_survey_8431234567_20160602_81045 SetVar: orderNumber=123456
