How to organize telephony in the office?

Question

Telephony

In general, the task was set: to start, you need 4 phones in the office; there are panasonic phones and fax phones and ordinary ones and there are siemens gigaset 120A. From the 1st calls will be transferred to others. There is no technically savvy person in the office, just like I have a mentor.
After studying the topic a little, I still don’t understand whether it makes sense to start a PBX in the office (it’s a little expensive, and in the future they will change the office faster).
IP telephony? SIP? Is it already to contact the provider with the Internet / telephone? And if not, are there any standard solutions? Do I need to buy VoIP-enabled phones? Router with VoIP support? And actually questions of compatibility of phones with all these technologies.
Or just buy 4 more lines and somehow organize with the help of additional ones?
I just would like to do everything smartly, but I don’t have any experience or special qualifications in this.

Answer 1

Make SIP telephony. Use, for example, zadarma.com - there is a free virtual PBX or similar services.
For end equipment, you will have to buy SIP phones or use gateways. Like this (it's simple, I use it at home)
Well, or write a specific technical specification, how many phones, how many lines, budget, etc. And already turn to knowledgeable people, or at least seeing the scale of work in front of you in parts to understand it yourself.
It’s not complicated here, it’s just that your question is general, but you need to look more specifically and look for a solution that suits you in terms of quality / convenience and cost.
Good luck to you!
+ habrahabr.ru/company/zadarma/blog/157861

Answer 2

Evaluate the goals and plans by telephony for several years, this is the only way to adequately plan the solution, otherwise there is a high probability of throwing everything away in a year and starting over.
It is not clear whether you need a local connection or a separate line for each phone is enough.
If the uncertainty cannot be eliminated, subscribe to a virtual PBX and buy ip phones in the required number, I would recommend grandstream (they have quite decent ip PBXs, then you can centrally steer the phones) or yealink, so the probability of throwing out investments is minimal.

Answer 3

1. First, find out if your provider has the ability to organize an IP PBX for you.
For example, my provider at a previous job provided such functionality, and it looked like this: the provider sends it in a convenient way through its channel to your office to the IP PBX installed by the provider (I remember there were some links) number. A telephone patch panel is divorced from the piece of iron, where your 4 internal numbers are stuck. Everything is controlled by the provider on request, your task is only to plug in the phones and use them.
We pay for renting a piece of hardware, renting a number and additionally pay for work on changing the configuration (add an internal number, submit another city number, etc.)
2. We take any IP telephony, even from those already advised.
We use either SIP devices or SIP softphones with headphones-microphone.
voice quality will depend on your internet channel mainly.
Both of the above options will allow you to "overwinter" until there is enough understanding of what will happen next with telephony.