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The answer is ITU Q.931ITU Q.931ISDN's Q.931 is the Layer 3 specification that is responsible for call control and management. These functions include call set up, tear down, and request for services from Layer 2. The purpose of this section is not to go over all of the possible state primitives, but to give you a good understanding of how Q.931 manages ISDN call control.
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Q: ISDN protocols that are responsible for call setup and call teardown?
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