Voxbay puzzle

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Across
  1. 3. cloud telephony platform
  2. 5. session initiation protocol
  3. 6. disconnect the call
  4. 7. interactive voice response
  5. 8. intercom device
  6. 10. blocks the unwanted calls
  7. 11. default barging
  8. 12. dual-tone multi-frequency
Down
  1. 1. Round robin call distribution
  2. 2. ring inbound call to all
  3. 3. attends the call by the same agent
  4. 4. supports concurrent calls
  5. 9. primary rate interface