Who can share the experience of deploying Cloud PBX?

Question

Telephony

It is necessary to deploy a PBX, without the use of CISCO and other equipment, exclusively by means of cloud technologies, you need to understand the scheme! It is possible to use GSM gateways.
You need to set up the operator's SIP settings on Asterisk, but there is no understanding how to do it. Thanks for links and comments

Answer 1

Especially now they are "like mushrooms after the rain." With a variety of offers.

Answer 2

Isn't it easier to connect to a ready-made cloud operator?
It is not expensive.

Answer 3

Заказываете хостинг от 300 Р и выше!
Разворачиваете своя Asterisk
Запускаете шлюзы и SIP операторы
И Радуетесь собственной АТС на хостинге