Organization of voip\SIP for a small office

Question

Asterisk

After reading most of the articles on Habré about sip and organizing it at home / in the office, I understood a lot of things, but still I could not draw up a complete picture of a practical solution, nor could I find a ready-made solution for the needs of the company.

I will make a reservation, I have not worked with solutions of this kind before at all.

There was an urgent need to organize something like this scheme for the office (small office, 3-4 employees, 3 telephones, 1 fax machine).

There is no dedicated Internet, there is yota with good reception quality.
There is no analog phone line.
I describe the minimum scheme.

You need one permanent Moscow number, and 4 (maximum, at the beginning 2 - manager and fax) internal.
And then the scheme is standard for a small desk, but I will describe it.
They call a landline number. If they know the extension, they get to a specific manager, or to a fax machine. If they don't know, they fall for a free manager.
In general, multi-channel is not so obligatory, there will not be many calls at all, so if this greatly complicates the process, then you can throw it away.

Further, outgoing calls: also occur via sip (sipnet, no? I read it, it seems that there are analogues, but I don’t know how it is, if there is an opportunity to explain, I would be very grateful). That is the essence of the requirements - the ability of the channel to transmit faxes (I think it is everywhere, but I'm not 100 percent sure), and good tariffs within Russia.

In general, everything is simple and ordinary.

If you have the opportunity to give at least some comments that can help me figure it out, I would be very happy.

PS I'm not very friendly with Linux. But according to the manulaka I will figure out how to do it, of course, the main thing is to understand the general scheme.
We need a solution that is as simple, customizable, and as cheap as possible. Perhaps all this can be organized in the likeness of such a contraption? www.yota.ru/ru/devices/centers/router/ Only you need more settings, you need the ability to make calls within the office, etc... The

first thing that came to mind when reading everything from habrahabr.ru/blogs/voip/ is

1. Buy a normal computer for a server. Or what other equipment will replace it? The main point from which you have to dance) The main question is right here.
2. Buy (???) additional equipment.
3. Select the service of a dedicated Moscow number from one of the providers ( TsNT gobaza.ru/price/Start-viz/untitled.php ? Or the same sipnet customer.sipnet.ru/cabinet/do_premium ?
4. Put something like Yate or more monstrous Asterisk? Set it up as a sip provider.
5. Buy regular inexpensive analog phones for employees. We are not going to use soft phones yet, regular phones are preferable. Or do I need voip? Set up an analog fax.
...

Thanks in advance for any information that can help me in solving this. Just a link, I'll figure it out.
Thanks in advance :)

Answer 1

Yes, yota is not very stable for VoIP: lags or echoes appear. Maybe it will, but it needs to be tested, because there are many conditions.
You can quickly try, for example, at the PBX Virtual Office Tools - there SIPs are connected for free and there is even a virtual fax, plus a bunch of useful gadgets. Instead of phones, you can use the simplest IP headset for 100 rubles / kg on ali :)

Answer 2

The simplest all-in-one software option is www.askozia.com/
As mentioned above, it is also possible on iron gateways ... BUT ... the main plug is yours - the delays will be simply terrible, it will be practically impossible to use. With that connection, get that idea out of your head.

Answer 3

1. For your needs, a powerful server is not needed.
2. Additional equipment: only iron voip phones. For example Linksys. It's more convenient than soft-phones.
3. It's up to you.
4. I would recommend an all-in-one solution. For example Elastix . A very convenient solution for quickly launching IP-PBX for 5 kopecks. There is also a convenient interface for managing IVR (this is a voice menu), etc.
5. In paragraph two painted. Faxing is more difficult. For fax, you will need a t38 capable gateway. You can take the same Linksys single-port or Addpak (thousands of all sorts of different ones). Whatever happens, try it. True, work is not guaranteed.
A couple of years ago, I came across a small piece of iron for a test, inside of which there was already an Asterisk with a web interface. She had 8 internal analog ports and 2 ports for external lines, and could still hold 16 voip clients. Of course, there was also a connection to an external SIP provider. Only now I can’t remember what this piece of iron was called. The Chinese brothers tried to do this.

Answer 4

As already mentioned, the easiest option is a virtual PBX. Installing your own SIP server for 3 people, and even on a wireless channel, is not the best and most expensive idea. Fortunately, now there are a lot of virtual PBXs, even free ones, for example, Digital Office. For SIP clients - I like the option on a smartphone. For example, a call comes in - if your manager in the office on good WiFi just answers in the SIP client. If YOTA / 4G with a good signal, you can also answer. If on the road or it’s not clear where, it presses the end and the call comes right there, but already via mobile communications. Yes, this is a redirect for which you need to pay, but the quality of the connection will be acceptable. And for a small office with an average load on the phone - it's also not expensive. On the other hand, full mobility is achieved with zero initial costs and a small monthly fee for traffic (we already have a smartphone on Android :).
Well, for a guaranteed quality of communication, you need wired Internet, a well-configured router with traffic prioritization, and hardware phones.

Answer 5

I can say right away that with this connection quality you will not have ice and the idea is not worth the candle, try to look for mobile office services from opsos, at least the ability to make and receive calls normally.

Answer 6

A. I missed the point about the quality of the channel. Fig idea.

Answer 7

In general, Dlink DVG-5004s is enough for your task. Right back. If the number of employees grows, then 5008s.
But in your current version there are 2 problems. Channel - too long delays. Fax machine. They are not friendly with voip...

Answer 8

I think that it will be cheaper for you to use the services of a virtual pbx.
In this case, you will not need to buy anything, you can receive calls to softphones, faxes too.
I can advise, several services, please contact.

Answer 9

Try to call at least somewhere through the eta, if the eta delays are acceptable for you, put trixbox, everything is simple there. Lots of screencasts. And faxes work out of the box.

Answer 10

Yes, and Elastix faxes ....