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Moving from ISDN2 to VOIP - any advice

Hi at my company we have an old phone system, with 3 X ISDN2 lines. We also have ADSL *mb from Demon for our Internet access.

We're about to move office and I'm thinking of a new VOIP phone system.

Has anyone got any advice / recommendations on the following:
1. Systems & suppliers of VOIP telephony
2. What sort of Internet connection service I'll need for say 8 voice lines and a comparable (8Mb/800k Download/upload) internet connection.
3. Recommended ISP for the above.
 
Hi there,

I would recommend that you have a seperate ADSL line for your VoIP calls and if possible from a ISP that will give you routable IPs (No-NAT). I would also suggest you choose a ISP that is not consumer focused, you generally get what you pay for when it comes to DSL services. You mention that you have 8 extensions, you need to calculate how many concurrent calls you need and which codec to identify the max available bandwidth you will need. This online calculator might help you.

http://www.asteriskguru.com/tools/bandwidth_calculator.php

You have the choice of taking a hardware based PBX system that connects to a SIP trunk from a ITSP and has SIP phones registered to it in the office. Alternatively you can take a hosted VoIP PBX system that would negate the cap ex expenditure for the PBX CPE. However you would still need to buy IP phones.

Hosted PBX works by you renting a virtual PBX service that sits on a server hosted in a data centre. Your phones connect to the service over the broadband connection and you generally administer the system through a web browser.

I am the head developer of Entanet's VoIP services so I am not going to recommend any ITSP in the interest of fair play, needless to say I know my systems inside out :smilet:

HTH

Any further questions just ask.
 
How many calls do you want to be ableto make at once? or are they all usually active all the time?

If so would have 2 seperate lines on 2 seperate Broadband connections through a load balancing router (seperate from your PC internet useage.)

That would be a perfect setup for a disaster if one went down. ( things you have to think about :crap: )

If you don't have 2 and the connection goes so do you calls (so always have the calling que have a normal landline or/and mobile number added in for such cases you'll then still get calls)

A nice fully function phone but budget Grandstream 2000 they do the job at a good price. £60 - £80

As for ISP Zen are good allrounders, but like i said above get 2 of them seperatly if you want to be sure! Might be worth getting a local VoIP company that can come and chat to you rather than a virtual online company that you never meet :hrmph:

I sell VoIP locally (East Yorkshire) and clients think it's great they can get in touch quick and also go round to discuse and sort any VoIP issues/additions. :D
 
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