Telegram Phone Calls from HomeAssistant (with Voice Messages)

Yes! Now HomeAssistant can make a Telegram phone call (with Voice) thanks to the CallMeBot API. You just need HA to execute a WGET or CURL command to get a Telegram Voice call and "read" your message.

URL to use:

http://api.callmebot.com/start.php?source=HA&user=@user&text=This is Home Assistant calling to you to inform you about something that is happening at your house&lang=en-GB-Standard-B

Parameters:
user is your Telegram Username/Alias (i.e @myusername) or you can also use your phone number including the international code. Important!: You need to authorize CallMeBot to contact you  here. This is required to avoid spam.
text, is the message that you want the bot to speak. You can encode the URL (i.e. %20 istead of space) or use the symbol "_" for the spaces.
lang is the language/voice that you want the bot to speak. You can get the list of languages here. Use the "Voice Name" (4th column) as parameter to use. Please note that only the Standard languages are supported. (Wavenet premium languages/voices  won't work with this API).

For example, calling to @myusername and speak the message in English with a Male voice:

wget "http://api.callmebot.com/start.php?source=HA&user=@myusername&text=This_is_Home_Assistant_calling_to_you_to_inform_you_about_something_that_is_happening_at_your_house&lang=en-GB-Standard-B"

For example, calling to +34 123 123 1123 and speak the message in Spanish:

wget "http://api.callmebot.com/start.php?source=HA&user=+331231231123&text=Este_es_Home_Assistant_llamando_para_informar_sobre_algo_que_esta_sucediendo_en_tu casa&lang=es-ES-Standard-A"

To do that in HA is pretty easy! You have different ways to do it.

Instructions: Using the HA REST Notify service:

Note: There is a bug in HA REST component introduced in version 2020.12 (possible since 0118.x). The issue seems to be resolved in the release 2021.2.0. More details here.

0) You need to authorize CallMeBot to contact you here. This is required to avoid spam.

1) Create a new "REST Notify" service in the configuration.yaml:

# Example configuration.yaml entry 
notify:
  - name: Telegram_Call
    platform: rest
    resource: https://api.callmebot.com/start.php
    data:
      source: HA
      user: "@username"   #enter your telegram username
      lang: en-GB-Standard-B        #specify the languange and voice to use. See above the different options.
      rpt: 2                        #how many times you want the message to be repeated by the bot.

# YAML code
...
action:
  service: notify.Telegram_Call
  data:
    message: "This+is+Home+Assistant+calling+you+a+to+inform+you+about+something+urgent"

How to test the notification

You can easly test the new notification service using the Services Section available in the "Developer Tools"
Example: