How to set up IP telephony for internal use?

Question

Telephony

Good afternoon.

There is a task to set up IP telephony within the company's local area network (~20 Cisco IP Phone 303). Calls are scheduled only within the local network. I want to make everything simple and reliable. I have never dealt with IP telephony before. After some time spent searching for information, a question arose.

Is it possible to manually enter IP addresses, numbers and other settings without deploying a PBX? I would appreciate any information and links to articles/books on this topic.

Answer 1

In general, yes, you can do it without a PBX, there are so-called direct ip calls and technically you can write them down under the buttons or in a book and make calls. From a practical point of view, the idea is so-so.
Raise the asterisk, it will take about 10 minutes for everything on a bare asterisk. Register internal subscribers and one rule in the dialplan. For a bare asterisk, even the most ancient stump4 with a huge margin is enough.

Answer 2

What is the point of raising peer-to-peer IP telephony only for internal point-to-point calls?
Raise a PBX or a virtual one on Asterisk, 3CX or something else, or an iron one on which router that supports this cisco - you will immediately have the norms of centralization, administration, extensibility and other goodies