Implementing Automatic Failover for High-Speed Internet

I have a small business client that uses Time-Warner Cable for their internet access and their VOIP phones.  They have had a couple of incidents in the last 2 years where their internet went down completely and was not restored for several days, losing them a lot of business. They would like to implement some sort of failover system whereby if Time-Warner goes down another system will kick in automatically to continue providing broadband internet.

I'm thinking of having DSL installed as a backup system. My question is how can I implement this so that if the cable service goes down, the DSL will automatically kick in and take over providing high-speed internet?
anuneznycAsked:
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getzjdCommented:
You can achieve something like this with a Sonicwall tz series http://www.sonicwall.com/us/products/Failover_Failback.html  I assume tz will fit since you said small buisness client.   http://www.sonicwall.com/us/products/TZ_Series.html#tab=compare 

Works pretty well for a small business and the cost should be in the $500 range.
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getzjdCommented:
I also recommend Sonicwall because you can implement bandwidth management rules  or qos for the voip.
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getzjdCommented:
Careful of using cheaper consumer level products for a business level solution, especially when they are a customer.  GIve them something they will be happy with, yet will not break the bank.
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anuneznycAuthor Commented:
Great. Thank you for the advice.
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