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SIP

Looking to provide VOIP and data across three offices nationwide.  I have the networking hardware (Cisco routers, Asterix servers, etc.) and a small IT staff.  I would like to order SIP services but I would prefer to use my own gear and not "rent" the SIP provider's gear.  I want control of my own hardware.  Anyone have any experience implementing publicly provided SIP service to get VOIP for thier offices?
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hi
- if your astrisk is running & you manage it well then connect all parties to it through sip extensions,,
& create a trunk to one of voip providers, & route all international calls to it.
- or install elastix on your server from www.elastix.org
it's very easy wizard,
- then do step 2 above.
 I wish this ansewers you,,
if you need more help,,it's my pleasure to help.
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Thank you guys have given me something to look into.  I need to also do a little self tutorial...I'm not sure what is meant by "SIP extensions".

I come from the old telepony world.  VOIP and SIP trunking is relatively new to me and I want to take advantage of them as best I can.  From what you have told me so far would we be on the right path to do the following?:
I have an office in Chicago and New York and Los Angelos.  I want to do what we used to call "toll bypass" and also Foreign Exchange (FX) calling.  For example if a customer calls a certain number at our NY office, so it's a local call,  it actually rings a number at a desk in our Chicago office.
These are some of the things I want to do with SIP ( and if possible still be able to take advantage of my inverntory of Cisco and Asterix gear).
Thanks
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Thanks great information.
Don't want 800 number per se.  I will want a customer in New York for example to dial a local number in his/her 646 area code, and have it ring on the desk of the service agent in Chicago...
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...So... will I be able to do that ?   -without using 800 numbers, be able to have a client dial a "local" number in New York and have it ring on the desk of the customer service agent in Chicago.  And have another client dial a "local" number in his/her native Chicago and have that ring at the desk of our salesman in New York.  Both clients have a local number (local to them) to dial.
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Thank you!
If you are using existing lines connected to your offices Asterisk can handle the routing without purchasing any further lines/numbers.  Assuming you do not need additional numbers or lines.

So say all customer billing is handled in Chicago.  So anytime a customer calls any of your numbers and chooses to go to billing,  the call would be routed to to the Chicago office's billing division. This would be transparent to the customer except of course the accent of the person answering the call.

If you are purchasing DID's you can buy them for anywhere.  So if you have lots of customers in any given city or area you can get a 'local' number for them to use.  Voip outfits are also very fast compared to traditional phone companies,  so DID's and trunks can be activated/deactivated on the fly in many cases.