VoIp; Huge Problem with NEC NEAX 2000

We currently have a NEC NEAX 2000 (Site 1) serving our executive office with over 150 phone/fax lines being served via the PBX. This is currently sitting on a standard T1. We have a co-location (Site 2) which is served NEC Electra 192 which has 17 extensions for voice and several for fax. We've also implemented a multilink interface between both sites (Site 1 = 3mbps mpls, Site 2 = 3mbps mpls). Currently the phone systems are not ip enabled and we would like to acquire the interface cards for both systems but I have no idea how to get this off the ground. We would like to be able to dial the extensions from site 1 to site 2 and vice-versa. We would also like the trunk from site 1 to carry the fax lines and voice calls for site 2. The mpls is currently at 35% cap. I need soup to nuts help on this scenario. The routers between site 1 and site 2 are cisco 2821. Your help with this scenario would be greatly appreciated. Should we be using asterisk for anything in this scenario?

TheLankAsked:
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grbladesCommented:
For linking them up you will need the interface for both of them and for both of them using the standard protocol. SIP is the most common but there are other less popular and older protocols.

If you cannot get the interfaces for them (dont support IP for example) then you can fit them eith a spare T1 interface and then use a separate piece of equipment to transfer the calls between the T1 interface and SIP. You can use Asterisk for this if you wish but there are also dedicated pieces of equipment to do this. Asterisk is free but more complex to setup.

Bandwidth wise you should need approx 80kbps of bandwidth per simultaneous telephne call over the mpls network. So given you have approx 2mbps of spare bandwidth you should be able to support 25 simultaneous calls without your normal data slowing down.

You will need to implement QOS over the mpls network so that if the line becomes busy the voip packets always get through and it is the other data which starts to be dropped and slowed down. This can be configured on the 2821 routers.
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grbladesCommented:
In order to use fax over the MPLS then both ends will need to support T.38. This is because fax/modem does not work well vith the voice compression methods which are used across voip networks. T.38 simulates the receiving fax at the local end and then decodes the fax tones locally and sends it to the remote end which then recreates the tones and sends them onto the final fax machine.
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TheLankAuthor Commented:
What would be the best/cheapest solution to get both sites up and running in the fashion I mentioned? Again thanks for the help. I know jack about VoIP; just a grasp on the technology and how it works. I literally need soup to nuts guidance on this scenario. Thanks again!
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grbladesCommented:
I forgot to mention earlier that you can get a T1 interface for a Cisco router and get it to do the T1 to SIP conversion.

My advice would be to see how much the IP interfaces are for your two telephone systems and get information on what VoIP protocols they support.

Then get a price for a T1 interface for both of your routers and for a T1 interface on both of your PBXs (if you dont already have a spare).

Then at least you have two sets of prices which you can choose between.
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TheLankAuthor Commented:
Once I get the info; would you be able to help with implementation?
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grbladesCommented:
I can give you some guidelines but my experience is with VoIP in general and Asterisk in particular.
I dont have any experience in configuring the Cisco routers.
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TheLankAuthor Commented:
cool
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