How to organize IP telephony in the office?


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Puzzled by the connection of 8-800 numbers and found that the proposed tariffs when forwarding to a regular room and when the Subscriber according to the technology selected TDM flow E1 or IP technology at the completion of the calls to the IP port vary greatly. Attention a question:

In what direction to dig: TDM or IP? Is it possible to organize everything on their own without the involvement of outside experts?
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5 Answers

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Well and if grandmas it is a pity to configure Asterisk in the office.
Costs: the server (although you can use and not particularly powerful machine if the office is small), if there is a city line adapter for the city network, if no — "Base" for 250 rubles a month with more channels or one — Alloincognito (+modem for 1500), but for free.
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For domestic subscribers — or at 2K SIP-backgrounds, or adapters. If the interior VERY much — they say there are some cool solutions...
If the components are normal and in the grid — you can put a USB tube+program.
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To access the city, then you can use the Europhone calls on Megafonovsky numbers — Tifon. For other Russian — pcTel. For long distance — you look at the directions...
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In principle, something from my article podcherpnut — Asterisk, telephony or home for (about)moved user — there is, of course, for "home" use, but the overall logic is close...
I'm thinking about the second part — "Asterisk for business or any office", but you need to find a "victim" for "field testing"! ;)
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I worked in the same firm.
There were solved with the help of local Linux administrator and Asterisk.
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Though in our "magic", the country had to sign a paper with the local state structure is that it will be used only for negotiations with clients and not for an alternate telephone channel.
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For a given task can give solution for cisk. This option is unlikely to be the cheapest though, I think one of the most stable in the work. And You do such a decision would not run, although, if necessary, will be able to help remotely. Yes, for free.
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To take, better used, the 2811 router ( 2801, but it is not fundamentally cheaper and noticeably weaker in the future). If you get voice bundle take — great, there will already be modules for recoding voices.
New clean 2811, the idea is that you can get for somewhere around $1400 plus remap module for about $500 (up to 16 streams)
How much you can get used, especially if there is a way into eBay, you will not tell.
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On it pour Call Manager Express (nothing complicated, even a few video instructions). License the fairness of this procedure, I did not specify :)
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This gateway to put in the Internet and for him to have IP inbound (and outbound) voice stream from operators. Traffic can be encrypted, if there is a demand and operator support. With online channel, you have to think — maybe we should take separate for that matter — depends on availability in Your particular case.
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If you take E1, then it is about $600 for the module interface to the router. But I don't see the point in taking 30 lines where enough for a dozen.
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Inside users to deliver software Communicator and issue the headset.
If necessary, raise the VPN gateway and put users anywhere — even at home.
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I repeat — this solution may not be the optimal cost, but it is guaranteed to work in the mode of "set it and forget it".
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Over iota about IP telephony forget but headaches with intermittent voice, echo and non-working Fax get nothing.
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We do not soar a brain to the person. You will help any digital PBX. Which to cling to a SIP provider and make calls around the city. Then buy yourself the incoming number.
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