Question

How to build a Cisco VOIP network

Asked by: ping_it

Hello,
I am interested in:
-connecting 3 houses with few Cisco IP phones in each
-the connection between those houses needs to be via the internet
-the internet is reached by ADSL/CABLE modems, so by an ethernet port to the modem
-no classic telephone service needs to be involved - calls between houses must be free

Please tell me how cheapest I can reach all of this using Cisco products.
Please tell me also what products I need.
Please tell me, without details, how those devices need to be connected with each others

Thanks

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Asked On
2009-09-28 at 03:41:06ID24766361
Topics

Voice Over IP

,

IP Telephony

,

Network Design & Methodology

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: ccie22921Posted on 2009-09-28 at 05:30:02ID: 25438714

Please answer the following questions before a response can be posted.

1.  Do you have a Cisco Voice deployment today?
2.  Do you require voicemail for all phones?
3.  How many total phones?
4.  How many lines (extensions, phone numbers)?
5.  If there are three houses, how many phones in each house?
6. Do you require off net calling?  Meaning, do you require PSTN access from each device or are you only concerned with calling between the houses from the Cisco sets?
7.  Will you require 911 calling access from these sets?

 

by: surbabu140977Posted on 2009-09-28 at 05:33:40ID: 25438739

Using Callmanager is out of question because that will be too costly. There can be only 2 solutions for your requirement. You need to have Cisco routers, that is mandatory. (you said cisco implementation)

1) Buy 1 Cisco 2800 series router with CME (Cisco call manager express). That would support 36 licenses and you can use Cisco softphone/hardware for the users to communicate.

OR

2) Buy 3 routers for all the 3 offices with FXS port module, so that  many number of analog phones can be connected and communicate using VOIP. e.g if 2 port FXS card is purchased then 2 analog telephones can be connected at that office to communicate.

I think the first one should be logical.

Thanks,
surajit

 

by: ping_itPosted on 2009-09-28 at 06:06:01ID: 25438958

Hello, here are the answers:

1.  Do you have a Cisco Voice deployment today?
No, nothing - in one house there is a Cisco851w router, if that can be used it's much better.

2.  Do you require voicemail for all phones?
I do not require voicemail - but if this add-on is free, good to have, otherwise no.

3.  How many total phones?
At least 1 phone in each house is mandatory. If the expense is not much bigger, then 2 phones. The total for 3 houses would be 3 phones. The design should allow expansion, meaning houses in future can be 4-5 or even 6.

4.  How many lines (extensions, phone numbers)?
Just 1 number per house.


5.  If there are three houses, how many phones in each house?
At least 1 phone per house if that allows for some saving of money.


6. Do you require off net calling?  Meaning, do you require PSTN access from each device or are you only concerned with calling between the houses from the Cisco sets?
I do not want PSTN access nowadays because I know it require more equipmet, thus more money to be spent. But I would like that in the future it to be possible to be added. For example... in 2 years I would like the Cisco IPphones to call between each others in the houses via internet, and to call to other numbers via PSTN line. But now I don't need it. Now I need to save money and have free calls between those houses.


7.  Will you require 911 calling access from these sets?
No, I do not need it.


Some details:
if they are compatible, I would like to use 800 series ISR. They are not so expensive.

 

by: ccie22921Posted on 2009-09-28 at 06:54:42ID: 25439333

You will still need to provide Call Control from some device other than an 800 series router.  Preferrebly, you will want to purchase, at a minimum, a 2811 Router with a Call Mgr Express bundle (as was stated above by surbabu140977).  This will include the required licenses, PVDM, and purchased analog cards that you will need to utilize in order to provide dial tone to the other devices. Now, with an analog card in the 2811 router at the first house, you can provide dial tone to at least four phones via a four port FXS card.  Now you have to address the other two houses and any future dwellings.  So you can either provide the softphone application running on a desktop/laptop, or you can provide a physical phone.  In the physical phone case you will need some device that will allow you to plug the phones into it, that device will also need to communicate back to the CME router at house number 1.  Least expensive option is the softphone app.  Be weary that most people are not used to using a software based phone.  There is a USB phone option out there, but it is not Cisco.  

 

by: ping_itPosted on 2009-09-28 at 07:32:31ID: 25439661

Unfortunately all the phones need to be physical, not software.

So, in the central house there should be a 2811, or the 2811 should be in each house?

What is the device that connects the ipphones?

 

by: deepdrawPosted on 2009-09-28 at 09:55:43ID: 25441001

I have 3 houses linked together using one cisco 1760 and two 1751's these are on ebay for about £50 each. On top they have a vpn module installed and dynamic multipoint VPN (needs 1 static ip). They also have incoming fxo ports, these have caller-id so are about £100 each. Also i have 1 router with CME and a 7960 phone (this allows me to phone both houses at the same time!). All three houses have vic 2fxs to plug normal phones into (£50 each) . The last pvdm i bought was a PVDM-256K-20 for £30 which can support you running 10 phones. If you want to just use ip phones you need a switch connected to the router good idea to use POE as you save money buying the phones. Also these routers can accept adsl cards so you can put the other routers back the box and save on electric.
This whole set up should cost less than a 2811!

 

by: deepdrawPosted on 2009-09-28 at 10:11:31ID: 25441150

Also 1751/1760 works with sip so you can use a sip provider instead of a vic fxo and receive calls for free :)

 

by: ping_itPosted on 2009-09-28 at 10:30:26ID: 25441317

wow this solution is really interesting...
why wasn't suggested to me this kind of routers, but a 2800 series? they cost at least 1000$ refurbished...

I hope you agree to explain me the same that you explained me, but in much more details.
I am really interested in your project!!
I would ask a new question specific for that project and you can reply me there (I will paste here the link). Please tell me if you agree.... here I would split the points between you and the others, because they also helped me, more expensive, but still help...

 

by: deepdrawPosted on 2009-09-28 at 23:55:05ID: 25446542

Yes, I am able to give you full config files without my passwords!
Also we can go into detail of exactly which hardware you need to buy to get your solution working.
I  think i need to explain that you would be buying second hand cisco routers which are "past end of life"
Also i have configured cisco router for the U.K, switzerland and Georgia (next to russia) so i dont know about other configurations but im pretty sure we can do this as you have a cisco router with adsl set up already.
Which country are you in btw?

Greg

 

by: ping_itPosted on 2009-09-29 at 00:58:03ID: 25446787

Here is the new question:
http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/VoIP/Q_24769289.html

I don't know how and if it's possible, but I would like to exchange contacts with you... maybe skype or similar?

20120131-EE-VQP-002

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