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Quick tech specs
  • Generation Network Interface Module
  • analog ports: 4
  • ISR4331-PM20
  • ISR4431-PM20
  • ISR4461-PM20
  • Voice / fax module
  • for P/N: ISR4321-PM20
  • ISR4351-PM20
  • ISR4461-K9-CAP
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Cisco Fourth-Generation Network Interface Module - voice / fax module
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