I want to install an IP PBX system in the company
I have 150 employees now, of whom 90 use IP phones
I have 3 separate branches
There are 60 IP phones in the main branch, and there are (5 landlines and one cell phone) to receive external calls from customers
In each of the other two branches, there is one landline and one mobile phone to receive outside calls from customers
Connecting all landlines and mobile lines (mentioned above) to receive external calls from customers and record them in one place (the call center unit in the main branch).
That any employee in any branch can make internal audio calls and contact any employee in any other branch internally.
A limited number of employees (managers) call the company from home via cell phone to any of the branches, (or even from outside the country) so that it is as if it is inside the company.
What are the lowest equipment (UCMs, Gateways,… etc) that can do this? and What are recommended equipment?
Sorry for the length, it may seem complicated because of the too-long explanation, but I think it is actually less complicated than that, especially for the great experts here.
What do you recommend?
I appreciate any information from you
I hope that the topic will be useful to all distinguished members of this wonderful forum.
Thank you so much