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How a Calls Works

How a Calls Works. Long Distance Carriers. Chicago. One Call Now. Blue Mile or Paetec. AT&T. Long Distance Carriers. Sprint. When we want to place a call it will be picked up by either a server at Blue Mile or Paetec. For discussion purposes we will assume we are sending through Blue Mile.

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How a Calls Works

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  1. How a Calls Works Long Distance Carriers Chicago One Call Now Blue Mile or Paetec AT&T Long Distance Carriers Sprint When we want to place a call it will be picked up by either a server at Blue Mile or Paetec. For discussion purposes we will assume we are sending through Blue Mile.

  2. AT&T south Level3 south Level3 midwest Blue Mile AT&T midwest AT&T regional Chicago Blue Mile will Least Cost Route the call to the least expensive route that is available within our routing plan. Level3 may route to another carrier if all its lines to AT&T are full.

  3. Chicago End Office Long Distance Switch End Office End Office Within the community there are local and long distance switches. There may be multiple end-office switches that talk to a central switch.

  4. Cell Tower regional cell switch Cell Tower Cell Tower Cell providers 1st need to find where the phone is, route it to the regional switch which passes it off to the cell tower which then contacts the phone.

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