### for local fluentd
$ gem install fluent-plugin-twilio

### for td-agent2 (standard)
$ sudo td-agent-gem install fluent-plugin-twilio

fluent_logger.post('notify.call', {
  :number   => ' 8109012345678',  # Required if default_number is brank
  :message  => 'Hello World!'   # Required if default_message is brank
})

<source>
  @type http
  port 8888
</source>

<match notify.call>
  @type twilio

  # Set account Sid and Token from twilio.com/user/account
  account_sid     TWILIO_ACCOUNT_SID           # Required
  auth_token      TWILIO_AUTH_TOKEN            # Required

  # Set caller ID with country code
  from_number      81312345678                 # Required

  # Set defaults of making outbound call.
  # To call multiple phone at the same time, list them with comma like below.
  default_number   819012345678, 818012345678  # Optional
  default_message "call from fluentd."         # Optional

  # Set log level to prevent info error
  @log_level       warn
</match>

<source>
  @type http
  port 8888
  @label @NOTIFY
</source>

<label @NOTIFY>
  <filter>
    @type record_transformer
    <record>
      message Hi. ${record["name"]} has made a order of ${record["item"]} just now.
    </record>
  </filter>
  <match>
    @type twilio
    # snip ...
  </match>
</label>

# test call to  819012345678 and say "Help! System ABC has down." with woman voice.
$ curl http://localhost:8888/notify.call -F 'json={"number":" 819012345678","voice":"woman","message":"Help! System ABC has down."}'

# check twilio activity log
$ tail -f /var/log/td-agent/td-agent.log