The E lead of a switch or a PBX is connected over trunks, called tie lines, to the M lead of a distant switch. Tie lines are special trunks provided to a PBX operator by a local telephone company. For this discussion, answer the following:

  • What is the purpose of E&M signaling?
    • How does it work?
    • How does it compare with others?
  • What are some ways hackers exploit PBX systems?
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