How to make an automatic phone call to a client?

Question

Automation

Greetings!
There is an online store. Now we send notifications about changes in the status of an order by email and in the form of sms.
There are problems: customers rarely look at mail, and you can’t put a lot of content into sms.
It would be more useful if the script called the client and read the audio messages.
Who faced, tell me where to dig, what services provide such services, what are the pitfalls?
Thank you.

Answer 1

We are using asterisk. From the php site, access to the astrix through fsockopen, and then the astrix's response that there will now be a call - the output of this message to the client and the call.
How to set up astrix - I don't know

Answer 2

We use a special automatic call service https://calltools.ru/. The system can be integrated into CRM and your task will be completed.