If you don't want to try to figure it out for yourself by toning the coax and looking to see what goes where, then you could try for a vendor meet with both providers and let the technicians fight it out onsite.
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
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