Setting up voip\\SIP for small office

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After reading most of the article on habré about sip and the organization of his home\\in the office, I realized a lot of things, but still coherent picture of the practical solution could not be and was not able to find solutions for the needs of the company.

Say, didn't work Earlier decisions of this kind at all.

There is an urgent need in the organization, about this scheme for the office (small office, 3-4 employee, 3 telephones, 1 Fax machine).

Dedicated Internet, there is yota with a good reception quality.
Analog telephone line no.
Describe the scheme-at least.

Need one permanent Moscow number and 4 (maximum, on top of Manager 2, and Fax) internal.
And then the scheme is standard for a small Desk, but I will describe.
Calling to a landline number. If you know the extension, they go on a specific Manager, or to a Fax machine. If you don't know — get on free Manager.
In General, channeling is not so required, calls will be not much, so if this greatly complicates the process, it can be thrown out.

Further, outgoing calls are via sip (sipnet, no? Honored-revered, like there counterparts, but do not know where, if you have the opportunity to explain, would be very grateful.) The essence of requirements — the ability of the channel to send faxes (I think, it is everywhere, but not sure 100 percent), good rates in Russia.

In General, everything is simple and ordinary.

If You will have the opportunity to give any comments that can help me to understand, I would be very happy.

PS I linecom no good. But Monolake will understand how to make certainly important to understand the General scheme.
We need as far as possible simple, custom and cheap solution. Perhaps that can be arranged in the likeness of such a thing? Only the settings you need, possibility of calls inside the office, etc...

What first came to mind when reading all of

1. Just buy a regular computer under the server. Or any other equipment that will replace it? The main point, which is necessary to dance) the Main issue here.
2. Buy (???) additional equipment.
3. Select a service dedicated to Moscow numbers from one of the providers (CNT Or the same SIPNET
4. To put something like Yate or Asterisk more monstrous? Configure it for your sip provider.
5. To buy a regular inexpensive analog phones to employees. Soft phones use is preferable to usual phones. Or is it voip? To put an analog Fax machine.

Thanks in advance for any information that might help me in solving this. Just a reference, I got it.
Thanks in advance :)
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7 Answers

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Yes, yota is not very stable for VoIP: there are lag or echo. Maybe rolled, but it is necessary to test for many conditions.
Quickly try possible, for example, on PBX Virtual Office Tools - there R connect free and there is even a virtual Fax, plus a bunch of useful widgets. Instead of phones, you can use the simple IP headset for 100 $ /kg on ali :)
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The easiest software version all-in-one —
As mentioned Above, and the iron locks... BUT... the main bottleneck is Your no — delay would be just awful, to be almost impossible. With such a connection, throw that idea out of my head.
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1. For your needs a powerful server is not needed.
2. Additional equipment: iron only voip phones. For Example Linksys. It is easier than soft-phones.
3. It is to your taste.
4. I would recommend to use solution all-in-one. For Example Elastix. A very convenient solution for quick launch of IP-PBX for 5 cents. There's also a comfortable interface for management of IVR (voice menu is), etc.
5. In paragraph two painted. Fax more difficult. For Fax you need a gateway with t38 support. You can take the same Linksys single port or Addpak (thousands of them all different). Which will then try. However, operation is not guaranteed.
A couple of years ago I came across a test on a small piece of iron, inside of which was already of Asterisk with a web interface. She had 8 analog ports internal and 2 ports for external lines, and could still hold 16 voip clients. Of course, connecting to external SIP-provider. Only now I can't remember how this piece of hardware was called. Chinese brothers tried to do.
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As already mentioned, the easiest option is a virtual PBX. To set the private SIP server for 3 people, but still on the wireless channel is not the best and expensive undertaking. Fortunately now a virtual PBX, even a free - bunch, for example a Digital Office. SIP clients - I like the option on the smartphone. For example, a call comes in - if your Manager in the office for good Wi-Fi, just responding to the SIP client. If YOTA/4G with a good signal - can also be answered. If the road is not clear or where - presses the end call and the call immediately comes, but for mobile communication. Yes, it's forwarding you have to pay, but the quality of connection will be acceptable. But for a small office with an average load on the phone - and not even expensive. But is achieved with full mobility at zero initial cost and a small monthly payment for the traffic (we believe that the Android smartphone you already have :).
Well, for the guaranteed quality connection need wired Internet, a properly configured router with traffic shaping and hardware phones.
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I can tell right away that this quality of connection you will have no ice and it is not worth the candle, try to look for the services of a mobile office opsosov at least the possibility to make and receive normal calls.
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A. Missed the point about the quality of the channel. A shit idea.
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In General, for your problem rather Dlink DVG-5004s. Straight back to back. If the number of employees will grow — 5008s.
But in your current version there are 2 problems. Channel — too big delay. Fax. They are not compatible with voip is th...
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