If you are upgrading an older system, it may make sense to hold on to that system. The advantages being you the system is already programmed for the organization so it will have a familiar look and feel to the end-user and customers. If you have the 2 or 3 cables run to key employees desks that run back to the older system, it is just a matter of them plugging in the phones to begin answering calls. It makes sense to have these lines terminated on separate jacks as to not create any confusion. By utilizing existing copper lines or dedicating copper lines to the older system you will have the infrastructure in place to keep business operational in the instance of an outage, just make sure that your primary provider can forward calls to a copper line before implementing this solutions.
Different Disasater Recovory Options for Phones-Option 1
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